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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) shares | Jul. 31, 2019 USD ($) item shares | May 31, 2019 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Stock-Based Compensation |  |  |  |  |  |  |
Purchase of common stock |  |  |  |  |  | 0.4697 |
Percentage of aggregate number of shares |  |  |  | 5.00% |  | 5.00% |
Stock based compensation expense |  |  |  | $ 16,835 | $ 672 | $ 11,296 | $ 35,972
Options outstanding | shares | 6,414,611 |  |  |  |  | 6,414,611 | 7,428,682
Shares reserved for issuance | shares | 11,137,824 |  |  | 11,005,115 |  | 11,137,824 |
Vesting percentage |  |  |  | 25.00% |  | 25.00% |
Maximum |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  | 3 years |
Expiration period |  |  |  | 10 years |  | 10 years |
Cancellation Period after termination of employment |  |  |  | 3 months |  | 3 months |
General and administrative |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Stock based compensation expense |  |  |  | $ 12,435 | $ 223 | $ 4,145 | $ 34,739
Executives | Redeemable Convertible Preferred Stock |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Temporary equity, shares issued discount to fair value | item |  | 11 |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Shares granted | shares |  |  |  | 132,709 |  | 2,450,718 |
Secondary market transaction |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Stock based compensation expense | $ 1,616 |  |  | $ 1,933 |  | $ 1,616 | 33,232
Secondary market transaction | General and administrative |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Stock based compensation expense |  |  | $ 33,232 |  |  |  | $ 33,232
Secondary market transaction | Redeemable Convertible Preferred Stock |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Temporary equity repurchased, shares | shares |  | 901,940 | 7,559,047 |  |  |  |
Temporary equity repurchased, value |  |  | $ 4,023 |  |  |  |
Temporary equity repurchase price | $ / shares |  |  | $ 0.53 |  |  |  |
Temporary equity, shares issued discount to fair value |  | $ 2,553 |  |  |  |  |
Secondary market transaction | Employees |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Stock based compensation expense | 927 |  |  |  |  |  |
Secondary market transaction | Former Employees |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Stock based compensation expense | $ 689 |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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