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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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, 2019:
| Options Outstanding |  | RSUs Outstanding |  | Options and RSUs Exercised |  | Available Shares |  | Total
2017 ECP | — |  |  | 733,500 |  |  | 41,664 |  |  | 1,524,836 |  |  | 2,300,000 |
2010 ECP | 250,498 |  |  | 611,645 |  |  | 3,566,950 |  |  | 652,925 |  |  | 5,082,018 |
2005 LTIP (*) | 13,748 |  |  | — |  |  | 950,085 |  |  | — |  |  | 963,833 |
Total | 264,246 |  |  | 1,345,145 |  |  | 4,558,699 |  |  | 2,177,761 |  |  | 8,345,851 |
(*) Expired June 2015
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, 2019:
| 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, 2018 | 264,246 |  |  | $ | 2.84 |  |  | 2.7 |  |  | $ | 2,019 |
Stock options exercised | — |  |  | $ | — |  |  | — |  |  | — |
Balance as of March 31, 2019 | 264,246 |  |  | $ | 2.84 |  |  | 2.7 |  |  | $ | 2,019 |
Stock options exercisable as of March 31, 2019 | 264,246 |  |  | $ | 2.84 |  |  | 2.7 |  |  | $ | 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, 2019:
| Unvested RSUs
| Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2018 | 1,571,864 |  |  | $ | 0.79 |
Granted | — |  |  | $ | — |
Vested | 186,031 |  |  | $ | 0.88 |
Forfeited | 40,688 |  |  | $ | 0.93 |
Unvested as of March 31, 2019 | 1,345,145 |  |  | $ | 0.78 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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