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Share-based Compensation | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenues | $ | 20 |  |  | $ | 41 |  |  | $ | 74 |  |  | $ | 95 |
Research and development | 193 |  |  | 117 |  |  | 408 |  |  | 316 |
Sales and marketing | 139 |  |  | 87 |  |  | 448 |  |  | 216 |
General and administrative | 450 |  |  | 643 |  |  | 1,014 |  |  | 1,352 |
Total | $ | 802 |  |  | $ | 888 |  |  | $ | 1,944 |  |  | $ | 1,979 |
Stock Options The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2016 | 6,356,203 |
Granted | 3,877,000 |
Exercised | (146,039 | )
Canceled | (3,520,681 | )
Outstanding — December 31, 2017 | 6,566,483 |
Granted | 1,795,642 |
Exercised | (620,350 | )
Canceled | (920,564 | )
Outstanding — June 30, 2018 | 6,821,211 |
Exercisable — June 30, 2018 | 2,524,208 |
At June 30, 2018, total unrecognized compensation expense related to stock options was $2.9 million, which is expected to be recognized over a weighted-average period of 2.03 years. Restricted Stock Units The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2016 | 2,975,800 |
Granted | 1,480,301 |
Vested | (1,193,721 | )
Forfeited | (2,206,403 | )
Non-vested — December 31, 2017 | 1,055,977 |
Granted | 384,912 |
Vested | (546,308 | )
Forfeited | (399,293 | )
Non-vested — June 30, 2018 | 495,288 |
At June 30, 2018, total unrecognized compensation expense related to RSUs was $0.8 million, which is expected to be recognized over a weighted-average period of 1.88 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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