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Share-based Compensation | 9 Months Ended
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Sep. 30, 2018
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 September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenues | $ | 153 |  |  | $ | 35 |  |  | $ | 227 |  |  | $ | 130 |
Research and development | 564 |  |  | 225 |  |  | 972 |  |  | 541 |
Sales and marketing | 313 |  |  | 320 |  |  | 761 |  |  | 536 |
General and administrative | 704 |  |  | 214 |  |  | 1,718 |  |  | 1,566 |
Restructuring | — |  |  | 169 |  |  | — |  |  | 169 |
Total | $ | 1,734 |  |  | $ | 963 |  |  | $ | 3,678 |  |  | $ | 2,942 |
Stock Options The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2017 | 6,566,483 |
Granted | 4,248,142 |
Exercised | (1,172,996 | )
Canceled | (1,164,750 | )
Outstanding — September 30, 2018 | 8,476,879 |
Exercisable — September 30, 2018 | 3,141,297 |
At September 30, 2018, total unrecognized compensation expense related to stock options was $4.5 million, which is expected to be recognized over a weighted-average period of 2.97 years. Restricted Stock Units The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2017 | 1,055,977 |
Granted | 919,226 |
Vested | (1,106,238 | )
Forfeited | (451,954 | )
Non-vested — September 30, 2018 | 417,011 |
At September 30, 2018, total unrecognized compensation expense related to RSUs was $0.5 million, which is expected to be recognized over a weighted-average period of 1.69 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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