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Stock Compensation and Unit-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Options Granted Activity | The following table presents a summary of stock options granted:
| Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value
Outstanding, December 31, 2018 |  | 2,228,904 |  |  | $ | 14.89 |  |  |  | 9.5 |  |  | *
Granted |  | 2,146,699 |  |  |  | 4.68 |  |  |  |  |  |  |
Exercised |  | — |  |  |  | — |  |  |  |  |  |  |
Cancelled |  | (1,244,337 | ) |  |  | 13.34 |  |  |  |  |  |  |
Outstanding, December 31, 2019 |  | 3,131,266 |  |  | $ | 8.53 |  |  |  | 8.9 |  |  | *
Exercisable, December 31, 2019 |  | 1,348,994 |  |  | $ | 11.99 |  |  |  | 8.6 |  |  | *
* de minimis |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Additional Information about Stock Options | The following table provides additional information about stock options that are outstanding and exercisable at December 31, 2019:
Exercise Price |  | Options Outstanding |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Options Exercisable |
$1.40 - $2.50 |  |  | 1,019,495 |  |  |  | 9.7 |  |  |  | 95,635 |
$2.51 - $7.52 |  |  | 647,629 |  |  |  | 9.2 |  |  |  | 324,900 |
$7.53 - $15.00 |  |  | 1,464,142 |  |  |  | 8.6 |  |  |  | 928,459 |
Summary of Restricted Stock Awards Granted Activity | The following table presents a summary of restricted stock awards granted:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |
Nonvested, December 31, 2018 |  |  | 185,571 |  |  | $ | 15.00 |  |
Granted |  |  | 204,088 |  |  |  | 6.88 |  |
Vested |  |  | (139,473 | ) |  |  | 14.25 |  |
Cancelled |  |  | (122,681 | ) |  |  | 9.27 |  |
Nonvested, December 31, 2019 |  |  | 127,505 |  |  | $ | 8.09 |  |
Summary of Restricted Stock and Deferred Stock Units Granted Activity | The following table presents a summary of restricted and deferred stock units (“Stock Units”) granted:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested, December 31, 2018 |  |  | 79,998 |  |  | $ | 15.00 |
Granted |  |  | 1,566,205 |  |  |  | 2.47 |
Vested |  |  | (274,939 | ) |  |  | 4.62 |
Cancelled |  |  | (129,771 | ) |  |  | 1.90 |
Nonvested, December 31, 2019 |  |  | 1,241,493 |  |  | $ | 2.86 |
Summary of Weighted Average Assumptions Used in Valuing Plans | The weighted average assumptions used in the Black-Scholes option pricing model in valuing stock options granted in the periods presented were:
|  | 2019 |  |  | 2018 |
Fair value at grant date |  | $ | 3.39 |  |  | $ | 2.50 |
Expected volatility |  | 95.9% |  |  | 70.9% |
Risk-free interest rate |  | 2.1% |  |  | 2.7% |
Expected holding period, in years |  |  | 5.9 |  |  |  | 5.9 |
Dividend yield |  |  | — |  |  |  | — |
2019 Employee Stock Purchase Plan |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Weighted Average Assumptions Used in Valuing Plans | The weighted average assumptions used in the Black-Scholes valuation of the fair value of the discount for the year ended December 31, 2019 were:
|  | 2019 |
Fair value at grant date |  | $ | 0.75 |
Expected volatility |  | 169% |
Risk-free interest rate |  | 2.3% |
Expected holding period |  | 6 months |
Dividend yield |  |  | — |

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