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Share-based Compensation | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [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 September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Cost of revenues | $ | 202 |  |  | $ | 153 |  |  | $ | 899 |  |  | $ | 227 |
Research and development | 183 |  |  | 564 |  |  | 1,315 |  |  | 972 |
Sales and marketing | 307 |  |  | 313 |  |  | 1,339 |  |  | 761 |
General and administrative | 561 |  |  | 704 |  |  | 2,402 |  |  | 1,718 |
Total | $ | 1,253 |  |  | $ | 1,734 |  |  | $ | 5,955 |  |  | $ | 3,678 |
Stock Options The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2018 | 8,796,212 |
Granted | 1,327,757 |
Exercised | (734,214 | )
Canceled | (866,105 | )
Outstanding — September 30, 2019 | 8,523,650 |
Exercisable — September 30, 2019 | 3,955,128 |
At September 30, 2019, total unrecognized compensation expense related to stock options was $6.2 million, which is expected to be recognized over a weighted-average period of 2.79 years. Restricted Stock Units The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2018 | 454,382 |
Granted | 781,067 |
Vested | (791,234 | )
Forfeited | (68,825 | )
Non-vested — September 30, 2019 | 375,390 |
At September 30, 2019, total unrecognized compensation expense related to RSUs was $0.6 million, which is expected to be recognized over a weighted-average period of 1.13 years.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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