CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 3,068	$ 1,625
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,582	1,150
Non-cash interest expense	970
Stock-based compensation expense	1,531	922
Deferred tax expense	10
Loss on revaluation of contingent consideration		2,005
Loss on disposal of assets	59	3
Changes in assets and liabilities:
Accounts receivable	(2,415)	(1,149)
Other receivables	172	(249)
Inventories	851	(3,092)
Prepaid expenses and other current assets	34	781
Accounts payable	(452)	(1,600)
Accrued liabilities	(4,220)	(4,277)
Long-term liabilities	(43)	70
Net cash provided by (used in) operating activities	1,147	(3,811)
Cash flows from investing activities:
Purchases of marketable securities	(28)	(3,969)
Redemptions of marketable securities	7,400	5,600
Purchases of property, plant and equipment	(1,295)	(431)
Net cash provided by investing activities	6,077	1,200
Cash flows from financing activities:
Exercise of stock options	1,333	821
Payment of contingent considerations	(1,663)	(498)
Net cash (used in) provided by financing activities	(330)	323
Effect of exchange rate changes on cash and cash equivalents	536	1,409
Net increase (decrease) in cash and cash equivalents	7,430	(879)
Cash and cash equivalents, beginning of period	122,233	54,092
Cash and cash equivalents, end of period	129,663	53,213
Supplemental disclosure of non-cash activities:
Income taxes paid	1,181	1,039
Payment of contingent consideration in common stock	$ 1,062	$ 875