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, 2018
USD ($)
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| Fair Value Disclosures [Abstract] | |
| Royalty payment | $ 307 |
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- References No definition available.
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- 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://fasb.org/us-gaap/role/ref/legacyRef
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