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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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 June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Cost of revenues | $ | 574 |  |  | $ | 20 |  |  | $ | 697 |  |  | $ | 74 |
Research and development | 957 |  |  | 193 |  |  | 1,132 |  |  | 408 |
Sales and marketing | 818 |  |  | 235 |  |  | 1,032 |  |  | 448 |
General and administrative | 1,296 |  |  | 616 |  |  | 1,841 |  |  | 1,014 |
Total | $ | 3,645 |  |  | $ | 1,064 |  |  | $ | 4,702 |  |  | $ | 1,944 |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2018 | 8,796,212 |
Granted | 825,757 |
Exercised | (414,792 | )
Canceled | (666,318 | )
Outstanding — June 30, 2019 | 8,540,859 |
Exercisable — June 30, 2019 | 2,868,281 |
Summary of Restricted Stock Unit Activity | The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2018 | 454,382 |
Granted | 273,867 |
Vested | (275,534 | )
Forfeited | (48,750 | )
Non-vested — June 30, 2019 | 403,965 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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