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Fair Value Measurements and Short-Term Investments - Narrative (Details) $ in Millions | Mar. 31, 2019 USD ($) year
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Contingent Royalty Obligation | Measurement Input, Expected Term |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Measurement input | year | 10
Contingent Royalty Obligation | Measurement Input, Discount Rate | Minimum |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Measurement input | 0.160
Contingent Royalty Obligation | Measurement Input, Discount Rate | Maximum |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Measurement input | 0.250
Estimate of Fair Value Measurement |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Contingent promissory note payable | $ | $ 14.8

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