CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 6,877,423	$ 2,796,435
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,508,943	1,696,885
Stock-based compensation expense	562,762	455,669
Deferred tax expense	992,856
Gain on bargain purchase		(314,244)
(Gain) loss on revaluation of contingent consideration	(18,587)	62,132
Changes in assets and liabilities:
Accounts receivable	(814,837)	(5,141,897)
Royalties and other receivables	3,817,118	(372,715)
Inventories	360,872	1,658,864
Prepaid expenses and other current assets	(334,937)	238,285
Accounts payable	(958,014)	1,207,265
Accrued liabilities	592,030	1,239,381
Long-term liabilities	(194,945)	212,763
Net cash provided by operating activities	12,390,684	3,738,823
Cash flows from investing activities:
Purchases of marketable securities	(18,088,695)	(22,977,047)
Redemptions of marketable securities	13,383,003	24,483,333
Purchases of property, plant and equipment	(1,105,217)	(513,515)
Net cash provided by (used in) investing activities	(5,810,909)	992,771
Cash flows from financing activities:
Exercise of stock options	2,034,545	134,986
Net cash provided by financing activities	2,034,545	134,986
Effect of exchange rate changes on cash and cash equivalents	(492,563)	(154,319)
Net increase in cash and cash equivalents	8,121,757	4,712,261
Cash and cash equivalents, beginning of period	29,209,821	11,167,745
Cash and cash equivalents, end of period	$ 37,331,578	$ 15,880,006