Net Loss Per Share - Antidilutive Securities (Details) - shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Diluted net loss per share attributable to common stockholders | |||
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding | 16,570,124 | 15,480,421 | 17,015,005 |
| Series A redeemable convertible preferred stock | |||
| Diluted net loss per share attributable to common stockholders | |||
| Percentage of cumulative dividends per year | 8.00% | ||
| Unvested restricted common stock | |||
| Diluted net loss per share attributable to common stockholders | |||
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding | 252,000 | 376,514 | 2,230,235 |
| Stock options to purchase common stock | |||
| Diluted net loss per share attributable to common stockholders | |||
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding | 16,318,124 | 15,103,907 | 14,784,770 |