CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| CONSOLIDATED BALANCE SHEETS | ||
| Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized | 500,000,000 | 500,000,000 |
| Common stock, shares issued | 25,832,895 | 23,729,780 |
| Common stock, shares outstanding | 25,832,895 | 23,729,780 |