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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2016
Common Stock. |
Schedule of shares of common stock reserved for issuance, on an as-converted basis |
|  | December 31, 2016 |  | December 31, 2015 |  | December 31, 2014 |
Convertible preferred stock |  |  | — |  |  | 14,274,741 |  |  | 8,921,438 |
Shares available for future option grants |  |  | 2,475,600 |  |  | 2,559,499 |  |  | 837,547 |
Outstanding options |  |  | 2,350,582 |  |  | 784,136 |  |  | 32,320 |
Unvested restricted common stock (founders and early exercise of stock options) |  |  | 611,698 |  |  | 924,535 |  |  | 768,706 |
Shares reserved for employee stock purchase plan |  |  | 200,000 |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  |  | 5,637,880 |  |  | 18,542,911 |  |  | 10,560,011 |
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