Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 80,589	$ 65,106	$ 153,802	$ 123,025
Cost of revenue	29,660	23,636	55,164	41,650
Gross profit	50,929	41,470	98,638	81,375
Operating expenses:
Research and development	8,094	6,264	15,128	11,265
Sales, general and administrative	44,163	35,876	86,884	68,945
Total operating expenses	52,257	42,140	102,012	80,210
(Loss) income from operations	(1,328)	(670)	(3,374)	1,165
Interest income, net	624	559	1,268	1,069
Other expense, net	(372)	(272)	(721)	(496)
(Loss) income before income taxes	(1,076)	(383)	(2,827)	1,738
Provision for (Benefit from) income taxes	482	(3,396)	1,837	(3,566)
Net (loss) income	(1,558)	3,013	(4,664)	5,304
Foreign currency translation adjustments, net of tax	(766)	(1,881)	(74)	(833)
Unrealized (loss) gains on available-for-sale securities, net of tax	(3)	88	67	369
Comprehensive (loss) income	(2,327)	1,220	(4,671)	4,840
Net income attributable to common stockholders	$ (1,558)	$ 3,013	$ (4,664)	$ 5,304
Net (loss) income per share attributable to common stockholders — Basic (in dollars per share)	$ (0.05)	$ 0.10	$ (0.14)	$ 0.18
Net (loss) income per share attributable to common stockholders — Diluted (in dollars per share)	$ (0.05)	$ 0.09	$ (0.14)	$ 0.16
Weighted average shares used to compute net (loss) income per share attributable to common stockholders — Basic (in shares)	33,219,487	30,210,322	32,420,105	30,100,162
Weighted average shares used to compute net (loss) income per share attributable to common stockholders — Diluted (in shares)	33,219,487	33,308,193	32,420,105	33,137,364