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Summary of Significant Accounting Policies (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Royalty Revenue |  |
Number of types of royalty revenue streams | 2 |
Stock-Based Compensation and Equity Incentive Plans |  |
Discount from the fair market value (as a percent) | 15.00% |
Cash and Cash Equivalents |  |
Maximum original maturity of cash equivalents (in months) | 3 months |
Minimum |  |
Intangible Assets |  |
Useful life (in years) | 1 year | 1 year
Maximum |  |
Intangible Assets |  |
Useful life (in years) | 10 years | 10 years

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