CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| CONDENSED BALANCE SHEETS | ||
| Convertible preferred stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Convertible preferred stock, shares authorized | 0 | 14,274,741 |
| Convertible preferred stock, shares issued | 0 | 14,274,741 |
| Convertible preferred stock, shares outstanding | 0 | 14,274,741 |
| Convertible preferred stock, liquidation preference (in dollars) | $ 108,500 | |
| Preferred stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Preferred stock, shares authorized | 10,000,000 | 0 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized | 290,000,000 | 20,000,000 |
| Common stock, shares issued | 20,922,428 | 1,431,615 |
| Common stock, shares outstanding | 20,922,428 | 1,431,615 |