Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands |
Mar. 31, 2019 |
Dec. 31, 2018 |
| Convertible preferred stock, authorized (in shares) |
10,883,950
|
10,883,950
|
| Convertible preferred stock, outstanding (in shares) |
7,538,671
|
7,095,746
|
| Convertible preferred stock, liquidation preference (in dollars) |
$ 40,281
|
$ 36,964
|
| Common Stock, par value (in dollars per share) |
$ 0.0001
|
$ 0.0001
|
| Common Stock, authorized (in shares) |
20,441,982
|
20,441,982
|
| Common Stock, issued (in shares) |
5,513,531
|
5,513,531
|
| Common stock, outstanding (in shares) |
5,513,531
|
5,513,531
|
| Series A Convertible Preferred Stock |
|
|
| Convertible preferred stock, par value (in dollars per share) |
$ 0.0001
|
$ 0.0001
|
| Convertible preferred stock, authorized (in shares) |
3,093,898
|
3,093,898
|
| Convertible preferred stock, issued (in shares) |
3,093,898
|
3,093,898
|
| Convertible preferred stock, outstanding (in shares) |
3,093,898
|
3,093,898
|
| Convertible preferred stock, liquidation preference (in dollars) |
$ 7,000
|
$ 7,000
|
| Series B Convertible Preferred Stock |
|
|
| Convertible preferred stock, par value (in dollars per share) |
$ 0.0001
|
$ 0.0001
|
| Convertible preferred stock, authorized (in shares) |
7,790,052
|
7,790,052
|
| Convertible preferred stock, issued (in shares) |
4,444,773
|
4,001,848
|
| Convertible preferred stock, outstanding (in shares) |
4,444,773
|
4,001,848
|
| Convertible preferred stock, liquidation preference (in dollars) |
$ 33,281
|
$ 29,964
|