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Common Stock (Tables)

12 Months Ended

Dec. 31, 2017

Common Stock

Schedule of Common Stock reserved for future issuance

		As of December 31,
		2017			2016
Warrants for the purchase of Common Stock			24,566			24,566
Options to purchase Common Stock			3,669,791			2,939,968
Employee Stock Purchase Plan			523,659			335,484
​	​	​	​	​	​	​	​
Total			4,218,016			3,300,018
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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