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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 1,625 $ 2,930
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 1,150 1,150
Stock-based compensation expense 922 702
Deferred tax expense   87
Loss on revaluation of contingent consideration 2,005 1,111
Loss on disposal of assets 3  
Changes in assets and liabilities:    
Accounts receivable (1,149) (7,237)
Other receivables (249) (155)
Inventories (3,092) (514)
Prepaid expenses and other current assets 781 314
Accounts payable (1,600) 435
Accrued liabilities (4,277) 1,380
Long-term liabilities 70 (2,508)
Net cash used in operating activities (3,811) (2,305)
Cash flows from investing activities:    
Purchases of marketable securities (3,969) (3,287)
Redemptions of marketable securities 5,600 4,838
Purchases of property, plant and equipment (431) (1,272)
Net cash provided by investing activities 1,200 279
Cash flows from financing activities:    
Exercise of stock options 821 402
Payment of contingent considerations (498) (99)
Net cash provided by financing activities 323 303
Effect of exchange rate changes on cash and cash equivalents 1,409 (2,430)
Net increase (decrease) in cash and cash equivalents (879) (4,153)
Cash and cash equivalents, beginning of period 54,092 35,363
Cash and cash equivalents, end of period 53,213 31,210
Supplemental disclosure of non-cash activities:    
Income taxes paid 1,039 $ 1,100
Payment of contingent consideration in common stock $ 875