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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option and PRSU Activity | The following table shows the stock option and PRSU activity, as follows:
|  | Shares Issuable Under Options and PRSUs |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  |  |  | (In years) |  |  | (In thousands) |
Outstanding as of January 1, 2018 |  |  | 782,340 |  |  | $ | 14.28 |  |  |  | 8.8 |  |  | $ | 8.5 |
Granted |  |  | 267,950 |  |  |  | 5.02 |  |  |  |  |  |  |  |  |
Exercised |  |  | (15,120 | ) |  |  | 4.74 |  |  |  |  |  |  |  |  |
Forfeited / Canceled |  |  | (60,353 | ) |  |  | 7.31 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 974,817 |  |  |  | 12.31 |  |  |  | 8.2 |  |  |  | — |
Granted |  |  | 815,400 |  |  |  | 1.75 |  |  |  |  |  |  |  |  |
PRSUs vested |  |  | (78,450 | ) |  |  | 4.83 |  |  |  |  |  |  |  |  |
Forfeited / Canceled |  |  | (11,500 | ) |  |  | 4.41 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2019 |  |  | 1,700,267 |  |  | $ | 7.64 |  |  |  | 8.2 |  |  | $ | — |
Stock awards vested and expected to vest as of December 31, 2019 |  |  | 1,645,267 |  |  | $ | 7.64 |  |  |  | 8.2 |  |  | $ | — |
Options exercisable as of December 31, 2019 |  |  | 882,576 |  |  | $ | 12.49 |  |  |  | 7.3 |  |  | $ | — |
Schedule of Stock-Based Compensation Expense Related to Stock-Based Awards | Total compensation expense related to all of the Company’s stock-based awards for the years ended December 31, 2019 and 2018 was comprised of the following (in thousands):
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |
Stock-based compensation classified as: |  |  |  |  |  |  |  |
Research and development expense |  | $ | 343 |  |  | $ | 249 |
General and administrative expense |  |  | 965 |  |  |  | 1,294 |
Total stock-based compensation expense |  | $ | 1,308 |  |  | $ | 1,543 |
Schedule of Assumptions Used in Black-Scholes Option Pricing Model to Determine the Fair Value of Stock Options Granted | The following table presents the assumptions used in the Black-Scholes option pricing model to determine the fair value of stock options granted in the periods presented, as follows:
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |
Expected stock price volatility |  | 74% - 87% |  |  | 63% - 86% |
Risk-free interest rate |  | 1% - 3% |  |  | 2% - 3% |
Expected life of option (in years) |  | 6 |  |  | 5 - 7 |
Estimated dividend yield |  | 0% |  |  | 0% |

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