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Share-based Compensation | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation | Share-based Compensation 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.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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