Condensed Consolidated Statements of Operations and Comprehensive Income (unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Product revenue	$ 20,067,407	$ 18,882,277	$ 34,561,896	$ 32,495,605
Licensing, milestone and contract revenue	760,970	742,492	1,513,492	1,489,824
Total revenue	20,828,377	19,624,769	36,075,388	33,985,429
Operating expenses:
Cost of product revenue	6,311,332	8,084,226	11,152,502	14,497,707
Research & development	1,829,052	1,298,170	3,411,962	2,831,273
Selling, general & administrative	3,400,679	4,108,503	7,347,793	7,459,519
Restructuring charges	(111,178)		(246,785)
Total operating expenses	11,429,885	13,490,899	21,665,472	24,788,499
Income from operations	9,398,492	6,133,870	14,409,916	9,196,930
Interest income (expense), net	(36,381)	(49,129)	(75,939)	(100,332)
Income before income taxes	9,362,111	6,084,741	14,333,977	9,096,598
Provision for income taxes	3,467,219	2,347,873	5,371,083	3,447,611
Net income	5,894,892	3,736,868	8,962,894	5,648,987
Basic net income per share:
Net income	$ 0.44	$ 0.28	$ 0.67	$ 0.43
Basic weighted average common shares outstanding	13,510,573	13,262,023	13,459,049	13,212,424
Diluted net income per share:
Net income	$ 0.40	$ 0.26	$ 0.62	$ 0.39
Diluted weighted average common shares outstanding	14,578,927	14,443,794	14,484,978	14,302,439
Net income	5,894,892	3,736,868	8,962,894	5,648,987
Other comprehensive income
Foreign currency translation adjustment	340,095	(1,600,204)	(409,355)	(843,743)
Comprehensive income	$ 6,234,987	$ 2,136,664	$ 8,553,539	$ 4,805,244