Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (Parenthetical) $ in Thousands |
12 Months Ended |
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Dec. 31, 2017
USD ($)
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| Fair Value Disclosures [Abstract] | |
| Royalty payments | $ 235 |
| Milestone payment related to financing | $ 25 |
| X | ||||||||||
- Definition Milestone payment related to financing. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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