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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
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 September 30, 2019:
| Options Outstanding |  | RSUs Outstanding |  | Options and RSUs Exercised |  | Available Shares |  | Total
2017 ECP | — |  |  | 433,615 |  |  | 511,544 |  |  | 1,354,841 |  |  | 2,300,000 |
2010 ECP | 14,498 |  |  | 229,004 |  |  | 3,855,091 |  |  | 983,425 |  |  | 5,082,018 |
2005 LTIP (*) | 3,750 |  |  | — |  |  | 960,083 |  |  | — |  |  | 963,833 |
Total | 18,248 |  |  | 662,619 |  |  | 5,326,718 |  |  | 2,338,266 |  |  | 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 September 30, 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 canceled | 245,998 |  |  | $ | 2.92 |  |  | — |  |  | — |
Balance as of September 30, 2019 | 18,248 |  |  | $ | 1.74 |  |  | 1.8 |  | $ | 2,019 |
Stock options exercisable as of September 30, 2019 | 18,248 |  |  | $ | 1.74 |  |  | 1.8 |  | $ | 2,019 |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes the activities for our unvested RSUs for the three months ended September 30, 2019:
| Unvested RSUs |  |
| Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2018 | 1,571,864 |  |  | $ | 0.79 |
Granted | 1,155,097 |  |  | $ | 0.33 |
Vested | 944,052 |  |  | $ | 0.58 |
Forfeited | 1,120,290 |  |  | $ | 0.83 |
Unvested as of September 30, 2019 | 662,619 |  |  | $ | 0.21 |

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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=116856206&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure for stock option 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 (d) -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 (e) -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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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