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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock-Based Compensation [Abstract] |
Information about Stock Options Outstanding | The following tables summarize information about stock options and RSUs outstanding at December 31, 2018:
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 |
$   0.24-   1.58 |  |  | 653,816 |  |  |  | 0.26 |  |  | $ | 1.16 |  |  |  | 653,816 |  |  |  | 0.26 |  |  | $ | 1.16 |
$   1.74-   6.95 |  |  | 4,091,396 |  |  |  | 7.86 |  |  |  | 4.04 |  |  |  | 1,947,678 |  |  |  | 6.90 |  |  |  | 4.24 |
$ 14.52- 35.25 |  |  | 1,253,625 |  |  |  | 3.71 |  |  |  | 23.16 |  |  |  | 1,253,625 |  |  |  | 3.71 |  |  |  | 23.16 |
|  |  | 5,998,837 |  |  |  | 6.16 |  |  | $ | 7.72 |  |  |  | 3,855,119 |  |  |  | 4.74 |  |  | $ | 9.87 |
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, 2015 |  |  | 4,999,928 |  |  | $ | 8.76 |  |  |  | — |  |  | $ | — |
Options granted |  |  | 429,000 |  |  |  | 4.77 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (50,357 | ) |  |  | 0.40 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2016 |  |  | 5,378,571 |  |  | $ | 8.52 |  |  |  | — |  |  | $ | — |
Options granted |  |  | 1,613,500 |  |  |  | 4.06 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (12,500 | ) |  |  | 1.74 |  |  |  | — |  |  |  | — |
Options cancelled |  |  | (1,841,505 | ) |  |  | 4.71 |  |  |  | — |  |  |  | — |
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 |  |  |  | 6.16 |  |  | $ | 810 |
Options exercisable at December 31, 2018 |  |  | 3,855,119 |  |  | $ | 9.87 |  |  |  | 4.74 |  |  | $ | 809 |
Restricted Stock Units Activity | The following tables summarize activity under the Plan for the indicated periods:
|  | RSUs |
|  | Number of RSUs |  |  | Weighted Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2015 |  |  | 359,956 |  |  | $ | 13.22 |  |  | $ | — |
RSUs granted |  |  | 219,331 |  |  |  | 4.75 |  |  |  | — |
RSUs vested |  |  | (155,852 | ) |  |  | 15.27 |  |  |  | — |
Outstanding at December 31, 2016 |  |  | 423,435 |  |  | $ | 8.08 |  |  | $ | — |
RSUs granted |  |  | 220,664 |  |  |  | 3.83 |  |  |  | — |
RSUs vested |  |  | (174,438 | ) |  |  | 10.47 |  |  |  | — |
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 |  |  | $ | — |
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, 2018 |  |  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
Stock options |  | $ | 2,926 |  |  | $ | 2,446 |  |  | $ | 3,436 |
RSUs |  |  | 1,129 |  |  |  | 1,540 |  |  |  | 1,962 |
Total stock-based compensation expense |  | $ | 4,055 |  |  | $ | 3,986 |  |  | $ | 5,398 |
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, 2018 |  |  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
Expected stock price volatility |  |  | 85.26 | % |  |  | 84.91 | % |  |  | 79.6 | %
Risk-free interest rate |  |  | 2.73 | % |  |  | 1.94 | % |  |  | 1.85 | %
Expected life term |  | 6.02 years |  |  | 6.08 years |  |  | 6.03 years |
Expected dividends |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %

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