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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation [Abstract] |
Information about Stock Options Outstanding | The following tables summarize information about stock options and RSUs outstanding at December 31, 2019:
Options Outstanding |  | Options Vested and Exercisable |
Range of Exercise Prices | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |
$   2.35 -  6.95 |  |  | 4,376,396 |  |  |  | 7.08 |  |  | $ | 4.29 |  |  |  | 2,826,062 |  |  |  | 6.48 |  |  | $ | 4.31 |
$ 14.52 - 35.25 |  |  | 1,253,625 |  |  |  | 2.71 |  |  | $ | 23.16 |  |  |  | 1,253,625 |  |  |  | 2.71 |  |  | $ | 23.16 |
|  |  | 5,630,021 |  |  |  | 6.11 |  |  | $ | 8.49 |  |  |  | 4,079,687 |  |  |  | 5.32 |  |  | $ | 10.10 |
Stock Option Activity | The following tables summarize activity under the Plan for the indicated periods:
|  | Options |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2017 |  |  | 5,138,066 |  |  | $ | 8.41 |  |  |  | — |  |  | $ | — |
Options granted |  |  | 1,095,000 |  |  |  | 3.52 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (117,229 | ) |  |  | 1.15 |  |  |  | — |  |  |  | — |
Options cancelled |  |  | (117,000 | ) |  |  | 5.34 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2018 |  |  | 5,998,837 |  |  | $ | 7.72 |  |  |  | — |  |  | $ | — |
Options granted |  |  | 345,000 |  |  |  | 6.06 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (663,816 | ) |  |  | 1.23 |  |  |  | — |  |  |  | — |
Options cancelled |  |  | (50,000 | ) |  |  | 4.95 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2019 |  |  | 5,630,021 |  |  | $ | 8.49 |  |  |  | 6.11 |  |  | $ | 516 |
Options exercisable at December 31, 2019 |  |  | 4,079,687 |  |  | $ | 10.10 |  |  |  | 5.32 |  |  | $ | 314 |
|  | RSUs |
|  | Number of RSUs |  |  | Weighted Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2017 |  |  | 469,661 |  |  | $ | 5.19 |  |  | $ | — |
RSUs granted |  |  | 246,663 |  |  |  | 3.26 |  |  |  | — |
RSUs vested |  |  | (211,330 | ) |  |  | 6.19 |  |  |  | — |
Outstanding at December 31, 2018 |  |  | 504,994 |  |  | $ | 3.83 |  |  | $ | — |
RSUs granted |  |  | 229,996 |  |  |  | 6.06 |  |  |  | — |
RSUs vested |  |  | (207,334 | ) |  |  | 4.07 |  |  |  | — |
RSUs cancelled |  |  | (29,167 | ) |  |  | 4.65 |  |  |  |  |
Outstanding at December 31, 2019 |  |  | 498,489 |  |  | $ | 4.71 |  |  | $ | 86 |
Stock-Based Compensation by Type of Award | Stock-based compensation expense is included in general and administrative expense for each period as follows:
Stock-Based Compensation by Type of Award |  | Year Ended December 31, 2019 |  |  | Year Ended December 31, 2018 |
Stock options |  | $ | 2,756 |  |  | $ | 2,926 |
RSUs |  |  | 955 |  |  |  | 1,129 |
Total stock-based compensation expense |  | $ | 3,711 |  |  | $ | 4,055 |
Fair Value Assumptions | The fair value of each option grant was estimated on the date of grant using the Black-Scholes option pricing model using the following weighted average assumptions:
| Year Ended December 31, 2019 |  | Year Ended December 31, 2018 |
Expected stock price volatility |  |  | 92.34 | % |  |  | 85.26 | %
Risk-free interest rate |  |  | 2.09 | % |  |  | 2.73 | %
Expected life term | 6.14 years |  | 6.02 years |
Expected dividends |  |  | 0 | % |  |  | 0 | %

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