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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Contingent Consideration - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration liability | $ 10,928 | $ 10,956 | $ 705 | $ 683
Revenue-based Payments |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration liability | $ 10,928 | $ 10,956 |  |
Revenue-based Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Probability of milestone payment | 100.00% | 100.00% |  |
Revenue-based Payments | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Discount rate | 9.90% | 9.90% |  |
Revenue-based Payments | Maximum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Discount rate | 15.00% | 15.00% |  |
Other Payments |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration asset | $ 553 | $ 760 |  |
Other Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Discount rate | 10.00% | 10.00% |  |
Probability of milestone payment | 64.00% | 75.00% |  |

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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