Net Loss Per Share - Antidilutive Securities (Details) - shares
|
6 Months Ended |
Jun. 30, 2019 |
Jun. 30, 2018 |
| Diluted net loss per share attributable to common stockholders |
|
|
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding |
17,468,405
|
67,001,348
|
| Convertible preferred stock |
|
|
| Diluted net loss per share attributable to common stockholders |
|
|
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding |
|
51,845,438
|
| Warrants to purchase convertible preferred stock |
|
|
| Diluted net loss per share attributable to common stockholders |
|
|
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding |
|
135,567
|
| Restricted Common Stock |
|
|
| Diluted net loss per share attributable to common stockholders |
|
|
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding |
1,401,858
|
3,058,612
|
| Stock options |
|
|
| Diluted net loss per share attributable to common stockholders |
|
|
| Antidilutive securities excluded from computation of of diluted weighted average shares outstanding |
16,066,547
|
11,961,731
|