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Fair Value Measurement - Reconciliation of Level 3 Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Assets: |  |
Fair value of level 3 financial instruments at beginning of period | $ 3,877 |
Cash payment received as partial repayment of note receivable | (3,877) |
Fair value of level 3 financial instruments at end of period | 0 | $ 3,877
Liabilities |  |
Fair value of level 3 financial instruments at beginning of period | 9,990 |
Payments to CVR holders and other contingency payments | (4,925) | (5,000)
Fair value adjustments to contingent liabilities | 3,426 | 2,500
Fair value of level 3 financial instruments at end of period | 6,991 | 9,990
Crystal |  |
Liabilities |  |
Payments to CVR holders and other contingency payments | (1,000) | 0
Fair value adjustments to contingent liabilities | (924) | $ 0
Cydex |  |
Liabilities |  |
Payments to CVR holders and other contingency payments | (1,025) |
Cydex and Crystal |  |
Liabilities |  |
Fair value adjustments to contingent liabilities | $ (1,974) |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adjustment, Contingent Liabilities + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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