CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 163,179	$ 148,800	$ 128,511
Cost of revenue	81,645	72,443	64,234
Cost of revenue - inventory purchase commitment			(380)
Gross margin	81,534	76,357	64,657
Operating expenses:
Research and development	32,385	27,365	24,979
Sales and marketing	32,594	25,887	21,975
General and administrative	17,355	14,195	12,329
Litigation settlement	21	47	440
Total operating expenses	82,355	67,494	59,723
Income (loss) from operations	(821)	8,863	4,934
Other income (expense):
Interest, net	202	62	(454)
Other expense	(765)	(358)	(729)
Total other income (expense)	(563)	(296)	(1,183)
Income (loss) before income taxes	(1,384)	8,567	3,751
Income tax expense	268	411	248
Net income (loss)	$ (1,652)	$ 8,156	$ 3,503
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.07)	$ 0.34	$ 0.33
Diluted (in dollars per share)	$ (0.07)	$ 0.32	$ 0.16
Weighted-average number of shares:
Basic (in shares)	24,121	23,685	10,609
Diluted (in shares)	24,121	25,646	22,263