CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Current assets:
Cash and cash equivalents		$ 290,650	[1],[2]	$ 218,883	[3]
Short-term investments		1,306	[1]	1,469	[3]
Deferred tax assets		0	[1]	981	[3]
Notes receivable		84,615	[1]	58,398	[3]
Prepaid and other current assets		607	[1]	2,979	[3]
Total current assets		377,178	[1]	282,710	[3]
Property and equipment, net		22	[1]	31	[3]
Royalty rights		354,881	[1]	399,204	[3]
Notes and other receivables, long-term		287,241	[1]	306,507	[3]
Long-term deferred tax assets		26,358	[1]	16,172	[3]
Other assets		9,695	[1]	7,581	[3]
Total assets		1,055,375	[1]	1,012,205	[3]
Current liabilities:
Accounts payable		662	[1]	394	[3]
Accrued liabilities		7,253	[1]	8,009	[3]
Accrued Income Taxes, Current		21,019	[1]	3,372	[3]
Term loan payable	[1]	0		24,966
Total current liabilities		28,934	[1]	36,741	[3]
Convertible notes payable		230,850	[1]	228,862	[3]
Other long-term liabilities		53,060	[1]	50,650	[3]
Total liabilities		$ 312,844	[1]	$ 316,253	[3]
Commitments and contingencies (Note 8)			[1]		[3]
Stockholders' deficit:
Preferred stock, par value $0.01 per share, 10,000 shares authorized; no shares issued and outstanding		$ 0	[1]	$ 0	[3]
Common stock, par value $0.01 per share, 350,000 shares authorized; 165,115 and 164,287 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively		1,651	[1]	1,643	[3]
Additional paid-in capital		(117,205)	[1]	(117,983)	[3]
Accumulated other comprehensive income		418	[1]	2,256	[3]
Retained earnings		857,667	[1]	810,036	[3]
Total stockholders' equity		742,531	[1]	695,952	[3]
Total liabilities and stockholders' equity		$ 1,055,375	[1]	$ 1,012,205	[3]

[1] unaudited

[2] unaudited

[3] Note 1