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Stockholders' Equity - Stock Incentive Plan - General Information (Details)
12 Months Ended
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
plan
shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Number of stock-based compensation plans | plan     2
Incentive stock options and non-statutory stock options, exercise price to fair value of common stock, maximum (as a percent) 100.00% 100.00% 100.00%
Shareholder stock options, exercise price to fair value of common stock, maximum (as a percent) 110.00% 110.00% 110.00%
Unvested shares subject to repurchase (in shares) | shares 0 0 0
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting period 4 years 4 years 4 years
Term of award 10 years 10 years 10 years