Stock-Based Compensation (Tables)
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9 Months Ended |
Sep. 30, 2020 |
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| Share-based Payment Arrangement [Abstract] |
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| Schedule of Share-based payment award, Equity instruments Other than Options, Valuation Assumptions [Table Text Block] |
The following table summarizes the key assumptions and related information used to determine the fair value of the liability awards as of September 30, 2020: | | | | | | Restricted stock units | | Performance stock units | Number of simulations | 10,000,000 | | 10,000,000 | Expected stock volatility | 113.8% | | 118.5% | Dividend yield | —% | | —% | Risk-free interest rate | 0.2% | | 0.2% |
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| Schedule of Nonvested Performance-based Units Activity [Table Text Block] |
The following table provides information about performance stock units outstanding during the nine months ended September 30, 2020. | | | | | | | | | Awards | | Weighted Average Grant-Date Fair Value | Unvested balance as of December 31, 2019 | 872,672 |
| | $ | 13.44 |
| Vested | — |
| | — |
| Granted | — |
| | — |
| Canceled | (193,391 | ) | | 21.53 |
| Forfeited | — |
| | — |
| Unvested balance as of September 30, 2020 | 679,281 |
| | 11.13 |
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| Schedule of Stock-based Compensation Expense |
The following table summarizes stock-based compensation expense recognized for the periods presented: | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | (in thousands) | 2020 | | 2019 | | 2020 | | 2019 | Equity Awards | | | | | | | | Restricted stock awards | $ | 3,864 |
| | $ | 4,569 |
| | $ | 11,605 |
| | $ | 11,159 |
| Stock option awards | 399 |
| | 2,557 |
| | 1,674 |
| | 7,766 |
| Performance stock units | 653 |
| | 918 |
| | 2,659 |
| | 2,360 |
| Other stock-based compensation expense(1) | 112 |
| | 66 |
| | 226 |
| | 66 |
| Total stock-based compensation - equity awards | 5,028 |
| | 8,110 |
| | 16,164 |
| | 21,351 |
| Liability Awards | | | | | | | | Restricted stock units | 290 |
| | — |
| | 290 |
| | — |
| Performance stock units | 197 |
| | — |
| | 197 |
| | — |
| Total stock-based compensation - liability awards | 487 |
| | — |
| | 487 |
| | — |
| Total stock-based compensation expense | $ | 5,515 |
| | $ | 8,110 |
| | $ | 16,651 |
| | $ | 21,351 |
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(1) Includes expenses related to the Company’s Employee Stock Purchase Plan (the “ESPP”). In May 2019, an aggregate of 2,000,000 shares were authorized by stockholders for issuance under the ESPP, which became effective on July 1, 2019. As of September 30, 2020, the Company had 1,837,381 shares of Class A Common Stock available for future issuance.
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| Schedule of Restricted Stock Activity |
The following table provides information about restricted stock activity during the nine months ended September 30, 2020: | | | | | | | | | Awards | | Weighted Average Grant-Date Fair Value | Unvested balance as of December 31, 2019 | 4,838,996 |
| | $ | 8.51 |
| Granted | 9,657,211 |
| | 1.10 |
| Vested | (1,847,059 | ) | | 8.69 |
| Forfeited | (861,992 | ) | | 5.79 |
| Unvested balance as of September 30, 2020 | 11,787,156 |
| | 2.45 |
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| Summary of Stock Option Valuation Inputs |
The following table summarizes the assumptions and related information used to determine the grant-date fair value of stock option awards for the periods presented: | | | | | | | | |
| Nine Months Ended September 30, |
| 2020 |
| 2019 | Weighted average grant-date fair value per share | $ | 1.16 |
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| $ | 4.47 |
| Expected term (in years) | 6 |
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| 6 |
| Expected stock volatility | 86 | % |
| 46 | % | Dividend yield | — | % |
| — | % | Risk-free interest rate | 1.0 | % |
| 2.3 | % |
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| Summary of Stock Option Activity |
The following table provides information about stock option awards outstanding during the nine months ended September 30, 2020: | | | | | | | | | | | | | | | Options | | Weighted Average Exercise Price | | Weighted Average Remaining Term (in years) | | Aggregate Intrinsic Value (in thousands) | Outstanding as of December 31, 2019 | 4,764,167 |
| | $ | 15.99 |
| | | | | Granted | 124,000 |
| | 2.13 |
| | | | | Exercised | (366 | ) | | 0.25 |
| | | | $ | — |
| Forfeited | (129,757 | ) | | 13.15 |
| | | | | Expired | (2,325,391 | ) | | 16.37 |
| | | | | Outstanding as of September 30, 2020 | 2,432,653 |
| | 15.07 |
| | 6.6 | | $ | 22 |
| Exercisable as of September 30, 2020 | 1,955,295 |
| | 15.78 |
| | 6.2 | | $ | — |
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