Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
SaaS and license revenue		$ 173,540	$ 140,936	$ 111,515
Hardware and other revenue		87,566	67,952	55,797
Total revenue		261,106	208,888	167,312
Cost of revenue:
Cost of SaaS and license revenue	[1]	30,229	25,722	23,007
Cost of hardware and other revenue	[1]	69,151	51,652	44,172
Total cost of revenue	[1]	99,380	77,374	67,179
Operating expenses:
Sales and marketing		38,980	32,240	25,836
General and administrative		57,926	35,473	26,113
Research and development		44,272	40,002	23,193
Amortization and depreciation		6,490	5,808	3,991
Total operating expenses		147,668	113,523	79,133
Operating income		14,058	17,991	21,000
Interest expense		(190)	(178)	(196)
Other income / (expense), net		513	(348)	(485)
Income before income taxes		14,381	17,465	20,319
Provision for income taxes		4,227	5,697	6,817
Net income		10,154	11,768	13,502
Dividends paid to participating securities		0	(18,987)	0
Income allocated to participating securities		(12)	0	(12,939)
Net income / (loss) attributable to common stockholders		$ 10,142	$ (7,219)	$ 563
Net income / (loss) per share:
Basic (USD per share)		$ 0.22	$ (0.30)	$ 0.25
Diluted (USD per share)		$ 0.21	$ (0.30)	$ 0.14
Weighted average common shares outstanding:
Basic (in shares)		45,716,757	24,108,362	2,276,694
Diluted (in shares)		47,875,522	24,108,362	3,890,121
Cash dividends declared per share (USD per share)		$ 0	$ 0.36	$ 0

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