Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue, net	$ 32,650	$ 19,597	$ 57,509	$ 33,914
Cost of goods sold	21,462	14,150	37,668	23,882
Gross profit	11,188	5,447	19,841	10,032
Operating expenses
Research and development	4,009	1,898	7,555	3,902
Sales and marketing	1,497	1,053	2,830	1,960
General and administrative	3,952	2,447	7,506	4,821
Total operating expenses	9,458	5,398	17,891	10,683
Income (loss) from operations	1,730	49	1,950	(651)
Other income (expense)
Interest income	106	15	185	35
Interest expense	(60)	(296)	(222)	(602)
Other expense, net	228	(50)	201	(58)
Total other expense	274	(331)	164	(625)
Income (loss) before income taxes	2,004	(282)	2,114	(1,276)
Income taxes	(85)		(110)
Net income (loss)	$ 1,919	$ (282)	$ 2,004	$ (1,276)
Net income (loss) per share - basic	$ 0.13	$ (1.04)	$ 0.15	$ (4.77)
Net income (loss) per share - diluted	$ 0.12	$ (1.04)	$ 0.14	$ (4.77)
Weighted average shares used to compute net income (loss) per share - basic	14,785,437	270,912	13,794,384	267,711
Weighted average shares used to compute net income (loss) per share - diluted	15,641,694	270,912	14,620,570	267,711