CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $)	9 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Mar. 31, 2011
Revenue:
Product revenue	$ 13,215,053	$ 11,810,869	$ 41,834,188	$ 14,961,397
Royalty and other revenue	10,235,194	9,573,770	20,432,348	12,329,627
Total revenue	23,450,247	21,384,639	62,266,536	27,291,024
Operating expenses:
Cost of product revenue	5,157,135	4,186,670	24,957,243	5,579,759
Cost of royalty and other revenue	1,315,315	1,160,775	2,213,004	1,537,666
Research and development	9,461,960	8,744,548	10,489,811	12,528,819
Selling, general and administrative	9,050,382	5,580,215	13,226,732	8,018,851
Contingent consideration - fair value adjustments			610,877
Gain on bargain purchase	(427,478)		(314,244)
Total operating expenses	24,557,314	19,672,208	51,183,423	27,665,095
Income (loss) from operations	(1,107,067)	1,712,431	11,083,113	(374,071)
Investment income	161,053	287,430	218,604	356,729
Interest expense	(27,773)	(12,683)	(56,714)	(26,167)
Other income (expense)	(623,094)		26,403
Income (loss) before income taxes	(1,596,881)	1,987,178	11,271,406	(43,509)
Income tax (benefit) provision	15,744		(2,884,631)
Net income (loss)	(1,612,625)	1,987,178	14,156,037	(43,509)
Earnings (loss) per share:
Basic	$ (0.05)	$ 0.06	$ 0.46	$ 0.00
Diluted	$ (0.05)	$ 0.06	$ 0.45	$ 0.00
Weighted average shares outstanding:
Basic	30,774,467	30,778,430	30,914,424	30,781,881
Diluted	30,774,467	30,949,264	31,253,434	30,781,881
Other comprehensive income (loss):
Unrealized gain on investments	6,338		7,792
Foreign currency translation gain	107,289		1,790,551
Comprehensive income (loss)	$ (1,498,998)	$ 1,987,178	$ 15,954,380	$ (43,509)