Fair Value of Financial Instruments - Cross Licensing Liability (Details) (Estimate of Fair Value, Fair Value Disclosure, Level 3, Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012
Estimate of Fair Value, Fair Value Disclosure | Level 3 | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Incremental borrowing rate	9.00%
Cross-licensing liability	$ 15,818
Cross-licensing liability, Current Portion	3,000
Prepaid cross-licensing asset		$ 20,716