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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Contingent Consideration |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Contingent consideration liability | $ 10,031 | $ 10,912 | $ 10,956 | $ 11,077 | $ 5,572 | $ 683
Revenue-based Payments | Contingent Consideration |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Contingent consideration liability | $ 10,031 |  | $ 10,956 |  |  |
Measurement Input, Discount Rate | Revenue-based Payments | Contingent Consideration | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Unobservable inputs, contingent liability | 9.90% |  | 9.90% |  |  |
Measurement Input, Discount Rate | Revenue-based Payments | Contingent Consideration | Maximum | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Unobservable inputs, contingent liability | 15.00% |  | 15.00% |  |  |
Milestone Payment Probability | Revenue-based Payments | Contingent Consideration | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Unobservable inputs, contingent liability |  |  | 100.00% |  |  |
Contingent Receivable | Other Payments |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Contingent consideration asset | $ 308 |  | $ 760 |  |  |
Contingent Receivable | Measurement Input, Discount Rate | Other Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Unobservable inputs, contingent receivable asset | 10.00% |  | 10.00% |  |  |
Contingent Receivable | Milestone Payment Probability | Other Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |
Unobservable inputs, contingent receivable asset | 35.00% |  | 75.00% |  |  |

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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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