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Stock Bonus Plan - Summary of Change in Liability to Common Shares Subject to Repurchase and Associated Non-Cash Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Beginning Balance $ 842 $ 8,267
Non-cash compensation from ratable vesting 41 2,712
Non-cash compensation from change in fair value of liability 2 2,457
Other stock activity, net 516 (786)
Reclassification upon modification 0 (11,808)
Ending balance $ 1,401 $ 842