Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
SaaS and license revenue		$ 236,283	$ 173,540	$ 140,936
Hardware and other revenue		102,654	87,566	67,952
Total revenue		338,937	261,106	208,888
Cost of revenue:
Cost of SaaS and license revenue	[1]	35,610	30,229	25,722
Cost of hardware and other revenue	[1]	80,578	69,151	51,652
Total cost of revenue	[1]	116,188	99,380	77,374
Operating expenses:
Sales and marketing		43,490	38,980	32,240
General and administrative		55,396	57,926	35,473
Research and development		72,755	44,272	40,002
Amortization and depreciation		17,734	6,490	5,808
Total operating expenses		189,375	147,668	113,523
Operating income		33,374	14,058	17,991
Interest expense		(2,199)	(190)	(178)
Other income / (expense), net		1,066	513	(348)
Income before income taxes		32,241	14,381	17,465
Provision for income taxes		2,990	4,227	5,697
Net income		29,251	10,154	11,768
Dividends paid to participating securities		0	0	(18,987)
Income allocated to participating securities		(13)	(12)	0
Net income / (loss) attributable to common stockholders		$ 29,238	$ 10,142	$ (7,219)
Net income / (loss) per share:
Basic (USD per share)		$ 0.63	$ 0.22	$ (0.30)
Diluted (USD per share)		$ 0.59	$ 0.21	$ (0.30)
Weighted average common shares outstanding:
Basic (in shares)		46,682,141	45,716,757	24,108,362
Diluted (in shares)		49,153,948	47,875,522	24,108,362
Cash dividends declared per share (USD per share)		$ 0	$ 0	$ 0.36

[1] Exclusive of amortization and depreciation shown in operating expenses below.