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Fair Value Measurements (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Available-for-sale Securities |
$ 108,000us-gaap_AvailableForSaleSecurities
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$ 107,000us-gaap_AvailableForSaleSecurities
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| Reported Value Measurement [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Cash and Cash Equivalents, Fair Value Disclosure |
17,004,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
|
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| Fair Value, Inputs, Level 1 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cash and Cash Equivalents, Fair Value Disclosure |
17,004,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
|
| Marketable Securities, Fair Value Disclosure |
1,612,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
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| Money Market Funds [Member] | Reported Value Measurement [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Marketable Securities, Fair Value Disclosure |
48,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
|
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| Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
48,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
|
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| Mutual Funds [Member] | Reported Value Measurement [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
60,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
|
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| Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
60,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
|
|
| US Treasury Securities [Member] | Reported Value Measurement [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
1,283,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
|
|
| US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
1,283,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
|
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| US Government Agencies Securities [Member] | Reported Value Measurement [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
221,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
|
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| US Government Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
221,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
|
|
| Cash [Member] | Reported Value Measurement [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
12,229,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
|
|
| Cash [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
12,229,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
|
| Money Market Funds [Member] | Reported Value Measurement [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
4,775,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
|
|
| Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
4,775,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
|
|
| Estimate of Fair Value Measurement [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
17,004,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
|
|
| Marketable Securities, Fair Value Disclosure |
1,612,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
|
|
| Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
48,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
|
|
| Estimate of Fair Value Measurement [Member] | Mutual Funds [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
60,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
|
|
| Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
1,283,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
|
|
| Estimate of Fair Value Measurement [Member] | US Government Agencies Securities [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
221,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
|
|
| Estimate of Fair Value Measurement [Member] | Cash [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
12,229,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
|
|
| Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
4,775,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
|
|
| Reported Value Measurement [Member] | Asuragen [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Business Combination, Contingent Consideration, Liability |
4,476,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= pdii_AsuragenMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
|
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| Reported Value Measurement [Member] | RedPath [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Business Combination, Contingent Consideration, Liability |
$ 22,066,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= pdii_RedPathMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
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