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Common Stock (Tables)

12 Months Ended

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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