Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 30, 2012	Dec. 31, 2012
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and investments in marketable securities	$ 208,550,000		$ 208,550,000		$ 302,194,000
Restricted cash	25,000,000		25,000,000		25,000,000
Indebtedness	147,600,000		147,600,000
Senior secured notes, issued	125,000,000		125,000,000		125,000,000
Senior secured notes, interest rate	12.00%		12.00%
Number of business segments			1
Effective income tax rate	34.00%	32.00%	34.00%	32.00%
Maximum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Contingent payment related to royalty obligation	7,000,000		7,000,000
12% Senior Secured Notes due July 2017 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Restricted cash	$ 25,000,000		$ 25,000,000
Senior secured notes, interest rate	12.00%		12.00%
Maturity date of senior secured notes			Jul. 15, 2017