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STOCKHOLDERS' EQUITY (DEFICIT) AND COMPENSATION ARRANGEMENTS (Tables) | 3 Months Ended
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Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Stock Unit Activity | The table below summarizes restricted stock unit activity for employees and nonemployees under the 2011 Plan for the three months ended March 31, 2023:
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2022 | 2,876,089 |  |  | $ | 19.33 |
Granted | 125,486 |  |  | 8.74 |
Vested | (403,202) |  |  | 18.09 |
Forfeited | (683,337) |  |  | 14.70 |
Unvested at March 31, 2023 | 1,915,036 |  |  | $ | 18.64 |
Schedule of Weighted-average Assumptions for Stock Options | The weighted-average assumptions for stock options granted during the three months ended March 31, 2023 are outlined in the following table:
| Three Months Ended March 31, 2023
Dividend yield | 0.0 | %
Risk-free interest rate | 4.1 | %
Expected term (in years) | 2
Expected volatility | 78.2 | %
Schedule of Performance Share Unit Activity | The table below summarizes Performance Share Unit activity under the 2011 Plan for the three months ended March 31, 2023:
| Performance Share Units |  | Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2022 | 17,269 |  |  | $ | 24.13 |
Granted | — |  |  | — |
Vested | (17,269) |  |  | 24.13 |
Forfeited | — |  |  | — |
Unvested at March 31, 2023 | — |  |  | $ | — |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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