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Share-based Compensation | 3 Months Ended
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Mar. 31, 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 March 31,
| 2018 |  | 2017
Cost of revenues | $ | 54 |  |  | $ | 54 |
Research and development | 215 |  |  | 199 |
Sales and marketing | 309 |  |  | 129 |
General and administrative | 564 |  |  | 709 |
Total | $ | 1,142 |  |  | $ | 1,091 |
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 | 170,642 |
Exercised | (471,792 | )
Canceled | (322,480 | )
Outstanding — March 31, 2018 | 5,942,853 |
Exercisable — March 31, 2018 | 1,929,868 |
At March 31, 2018, total unrecognized compensation expense related to stock options was $2.1 million, which is expected to be recognized over a weighted-average period of 1.33 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 | 258,863 |
Vested | (179,718 | )
Forfeited | (58,543 | )
Non-vested — March 31, 2018 | 1,076,579 |
At March 31, 2018, total unrecognized compensation expense related to RSUs was $1.2 million, which is expected to be recognized over a weighted-average period of 2.17 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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