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v3.21.2

Stock-Based Compensation - Payroll Reduction Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for issuance | 11,137,824 | 11,005,115 | 11,137,824 |  | 11,137,824 |
Stock based compensation expense |  | $ 16,835 |  | $ 672 | $ 11,296 | $ 35,972
Cost not recognized | $ 5,245 |  | $ 5,245 |  | $ 5,245 |
Restricted stock units |  |  |  |  |  |
Number of Restricted Stock Awards |  |  |  |  |  |
Beginning Balance |  | 2,415,140 |  |  |  |
Canceled |  |  |  |  | (35,578) |
Ending Balance | 2,415,140 |  | 2,415,140 |  | 2,415,140 |
Weighted Average Fair Value |  |  |  |  |  |
Beginning balance |  | $ 3.64 |  |  |  |
Granted |  |  |  |  | $ 3.69 |
Canceled |  |  |  |  | 3.44 |
Ending balance | $ 3.64 |  | $ 3.64 |  | $ 3.64 |
Employee awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense |  | $ 2,529 |  | $ 672 | $ 9,680 | $ 2,740
Employee awards | Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reduced cash payroll costs |  |  |  |  | $ 3,979 |
Shares reserved for issuance | 2,356,045 |  | 2,356,045 |  | 2,356,045 |
Shares issued |  |  |  |  | 2,356,045 |
Stock based compensation expense | $ 6,506 | 1,105 | $ 6,506 |  |  |
Cost not recognized | $ 1,605 | $ 500 | $ 1,605 |  | $ 1,605 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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