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