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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 12,765,697 $ 4,602,924
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,271,181 2,592,824
Stock-based compensation expense 768,534 743,947
Deferred tax expense 2,442,596  
Gain on bargain purchase   (314,244)
Loss on revaluation of contingent consideration 46,521 339,433
Changes in assets and liabilities:    
Accounts receivable (2,118,953) (4,672,351)
Royalties and other receivables 2,535,498 (755,864)
Inventories 1,149,997 3,036,051
Prepaid expenses and other current assets 264,690 247,093
Accounts payable (1,529,213) 309,710
Accrued liabilities (495,056) 1,087,295
Long-term liabilities 490,267 (1,006,654)
Net cash provided by operating activities 18,591,759 6,210,164
Cash flows from investing activities:    
Purchases of marketable securities (23,998,430) (36,337,643)
Redemptions of marketable securities 19,893,195 36,863,333
Purchases of property, plant and equipment (3,774,847) (825,061)
Net cash used in investing activities (7,880,082) (299,371)
Cash flows from financing activities:    
Exercise of stock options 2,235,274 886,704
Net cash provided by financing activities 2,235,274 886,704
Effect of exchange rate changes on cash and cash equivalents 87,648 424,735
Net increase in cash and cash equivalents 13,034,599 7,222,232
Cash and cash equivalents, beginning of period 29,209,821 11,167,745
Cash and cash equivalents, end of period $ 42,244,420 $ 18,389,977