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Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
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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- Definition

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- Definition

The number of types of royalty revenues earned by the Company.

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The discount rate from market value on specific date that participants pay for shares.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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