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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Grants Outstanding | The following table summarizes the stock grants outstanding under our 2005 Long-Term Incentive Plan ("2005 LTIP"), the 2010 ECP and the 2017 ECP for the three months ended March 31, 2020:
| Options Outstanding |  | RSUs Outstanding |  | Options and RSUs Exercised |  | Available Shares |  | Total
2017 ECP | — |  |  | 1,165,479 |  |  | 728,346 |  |  | 7,356,175 |  |  | 9,250,000 |
2010 ECP (**) | 14,498 |  |  | 1,072,171 |  |  | 3,969,590 |  |  | 275,759 |  |  | 5,332,018 |
2005 LTIP (*) | — |  |  | — |  |  | 953,835 |  |  | — |  |  | 953,835 |
Total | 14,498 |  |  | 2,237,650 |  |  | 5,651,771 |  |  | 7,631,934 |  |  | 15,535,853 |
(*) Expired June 2015 (**) Expires April 2020
Schedule of Stock Option Award Activity | The following table summarizes the activities of stock option awards under the 2005 LTIP and the 2010 ECP as of March 31, 2020:
| Shares Subject to Options Outstanding |  |  |  |  |  |
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Balance as of December 31, 2019 | 18,248 |  |  | $ | 1.74 |  |  | 1.8 |  | $ | 2,019 |
Stock options canceled | 3,750 |  |  | $ | 3.7 |  |  | — |  |  | — |
Balance as of March 31, 2020 | 14,498 |  |  | $ | 1.23 |  |  | 1.64 |  | $ | 2,019 |
Stock options exercisable as of March 31, 2020 | 14,498 |  |  | $ | 1.23 |  |  | 1.64 |  | $ | 2,019 |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes the activities for our unvested RSUs for the three months ended March 31, 2020:
| Unvested RSUs |  |
| Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2019 | 2,568,951 |  |  | $ | 0.79 |
Granted | — |  |  | $ | — |
Vested | 331,301 |  |  | $ | 0.21 |
Forfeited | — |  |  | $ | — |
Unvested as of March 31, 2020 | 2,237,650 |  |  | $ | 0.27 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: 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=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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