Share-based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The Company included the following amounts for share-based compensation awards in the unaudited condensed consolidated statements of operations (in thousands):



	Three Months Ended March 31,
	2019		2018
Cost of revenues	$	123	$	54
Research and development	175		215
Sales and marketing	214		213
General and administrative	545		398
Total	$	1,057	$	880

Stock Options

The following table summarizes the Company’s stock option activity:



Outstanding — December 31, 2018	8,796,212
Granted	489,882
Exercised	(312,724	)
Canceled	(536,599	)
Outstanding — March 31, 2019	8,436,771
Exercisable — March 31, 2019	2,411,388

At March 31, 2019, total unrecognized compensation expense related to stock options was $5.8 million, which is expected to be recognized over a weighted-average period of 2.71 years.

Restricted Stock Units

The following table summarizes the Company’s restricted stock unit (“RSU”) activity:



Non-vested — December 31, 2018	454,382
Granted	238,617
Vested	(221,537	)
Forfeited	(1,250	)
Non-vested — March 31, 2019	470,212

At March 31, 2019, total unrecognized compensation expense related to RSUs was $1.0 million, which is expected to be recognized over a weighted-average period of 1.63 years.