Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Stock-Based Compensation

Schedule of weighted average assumptions for employee grants

	Three Months Ended
	March 31,
Valuation assumptions:	2018		2017
Expected volatility	58.40	%	61.00	%
Expected term (years)	6.08		6.03
Risk-free interest rate	2.32	%	2.24	%
Dividend yield	—		—

Summary of stock option activity

				Weighted
		Weighted		average
		average		remaining	Aggregate
	Number	exercise		contractual	intrinsic
	of shares	price		term	value
Outstanding at December 31, 2017	2,883,175	$	9.26
Granted	384,500		29.32
Exercised	(398,895)		4.36
Forfeited	(59,139)		16.77
Outstanding at March 31, 2018	2,809,641	$	12.54	7.6	$	73,778
Options vested and expected to vest at March 31, 2018	2,809,641	$	12.54	7.6	$	73,778
Exercisable at March 31, 2018	1,385,167	$	6.72	6.1	$	44,431

Schedule of recorded stock-based compensation expense related to stock options

	Three Months Ended
	March 31,
	2018		2017
Cost of revenue - product	$	250	$	95
Cost of revenue - service		270		43
Research and development		196		104
Sales and marketing		379		117
General and administrative		850		3,462
Total stock-based compensation expense	$	1,945	$	3,821