Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of allocated share-based compensation expense

The Company recognized stock-based compensation expense from all awards in the following expense categories (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of revenue	$	250	$	195	$	763	$	464
Research and development	683		383		1,637		871
Sales and marketing	508		169		1,012		368
General and administrative	5,746		3,034		15,304		8,677
Total	$	7,187	$	3,781	$	18,716	$	10,380

Schedule of restricted stock activity

Restricted share activity during the nine months ended September 30, 2019 was as follows:

	Number of Restricted Shares Outstanding	Weighted-Average Grant Date Fair Value
Unvested balances at December 31, 2018	997,014	$	23.93
Awards vested	(279,403)	23.85
Awards forfeited	(8,167)	28.06
Unvested balances at September 30, 2019	709,444	$	23.91

Restricted stock unit activity

Restricted stock unit activity during the nine months ended September 30, 2019 was as follows:

	Number of Restricted Stock Units Outstanding	Weighted-Average Grant Date Fair Value
Unvested balances at December 31, 2018
Units granted	1,013,747	39.31
Units vested	(105,104)	34.83
Awards forfeited	(5,000)	41.73
Unvested balances at September 30, 2019	903,643	$	39.82

Schedule of stock option activity

Stock option activity during the nine months ended September 30, 2019 was as follows:

	Number of Options Outstanding	Weighted– Average Exercise Price
Outstanding at December 31, 2018	408,899	$	8.08
Options exercised	(77,444)	6.12
Options forfeited	(556)	7.74
Options expired	(309)	1.49
Outstanding at September 30, 2019	330,590	$	8.55