CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue, net	$ 57,085	$ 36,549	$ 136,951	$ 94,058
Cost of goods sold	39,032	24,403	92,116	62,071
Gross profit	18,053	12,146	44,835	31,987
Operating expenses
Research and development	5,386	4,194	14,892	11,749
Sales and marketing	1,582	1,622	4,748	4,452
General and administrative	4,963	4,458	14,500	11,964
Total operating expenses	11,931	10,274	34,140	28,165
Income from operations	6,122	1,872	10,695	3,822
Other income (expense)
Interest income	82	95	236	280
Interest expense	(351)	(55)	(776)	(277)
Other income (expense), net	413	(55)	770	148
Unrealized foreign exchange loss	(3,160)	(203)	(2,270)	(205)
Total other income (expense)	(3,016)	(218)	(2,040)	(54)
Income before income taxes	3,106	1,654	8,655	3,768
Income taxes	(406)	(77)	(541)	(187)
Net income	$ 2,700	$ 1,577	$ 8,114	$ 3,581
Net income per share
Basic	$ .17	$ .11	$ .53	$ .25
Diluted	$ .16	$ .10	$ .50	$ .24
Weighted average shares used to compute net income per share
Basic	15,868,989	14,805,668	15,220,301	14,135,184
Diluted	16,693,656	15,594,544	16,184,991	14,949,827