| Summary of Equity Award Activity |
The following tables summarize the Company’s equity award activity for the year ended December 31, 2015: | | | | | | | | | | | | | | | Options | | Weighted- Average Exercise Price | | Weighted- Average Remaining Contractual Term (in years) | | Aggregate Intrinsic Value (in thousands) | Options to Purchase Class A Common Stock | | | | | | | | Outstanding at January 1, 2015 | 26,705,905 |
| | $ | 4.82 |
| | | | | Granted | 4,677,500 |
| | 2.27 |
| | | | | Exercised | — |
| | — |
| | | | | Forfeited/Canceled | (667,150 | ) | | 6.11 |
| | | | | Expired | (4,986,667 | ) | | 4.64 |
| | | | | Outstanding at December 31, 2015 | 25,729,588 |
| | $ | 4.36 |
| | 7.0 | | $ | 570 |
| Vested or expected to vest at December 31, 2015 | 25,729,588 |
| | $ | 4.36 |
| | 7.0 | | $ | 10,669 |
| Exercisable at December 31, 2015 | 19,923,008 |
| | $ | 4.77 |
| | 6.3 | | $ | 737 |
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| Summary of Company's Restricted Common Stock Awards Activity |
| | | | | | | | | Number of Restricted Share Awards | | Weighted- Average Grant Date Fair Value | Restricted Common Stock Awards | | | | Outstanding at January 1, 2015 | 166,813 |
| | $ | 5.73 |
| Granted | 242,916 |
| | 2.47 |
| Vested | (166,813 | ) | | 5.73 |
| Forfeited | — |
| | — |
| Outstanding awards at December 31, 2015 | 242,916 |
| | $ | 2.47 |
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