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Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Weighted Average Number of Shares Outstanding, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 113,217 | 112,640 | 112,183 | 111,599 | 111,332 | 110,826 | 110,553 | 110,358 | 112,415 | 110,769 | 110,041
Customer Concentraion Risk |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ 2.3 |  |  |  |  |  |  |  | $ 2.3 |  |
Financial Statement Presentation |  |  |  |  |  |  |  |  |  |  |
Maximum ownership percentage |  |  |  |  |  |  |  |  | 20.00% |  |
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 |  |
Customer Concentration Risk | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |
Customer Concentraion Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risk as a percentage |  |  |  |  |  |  |  |  | 73.00% |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  | 1 year | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  |  |  | 10 years | 10 years |
CRCS |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 4,788

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