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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation We maintain a stock-based compensation program intended to attract, retain and provide incentives for talented employees and directors and align stockholder and employee interests. Currently, we grant options and restricted stock units ("RSUs") from the 2010 Equity Compensation Plan (“2010 ECP”) and 2017 Equity Compensation Plan ("2017 ECP"). Option and RSUs vesting periods are generally up to three years and/or achieving certain financial targets. Compensation Expense For the three months ended March 31, 2019 and 2018, we recorded stock-based compensation expense for all equity incentive plans of $96,871 and $377,847, respectively. Total compensation cost not yet recognized at March 31, 2019 was $810,790 to be recognized over a weighted-average recognition period of 1.5 years. 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 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 |
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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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