Common Stock Reserved for Issuance

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Common Stock Reserved for Issuance

7. Common Stock Reserved for Issuance

The Company is required to reserve and keep available out of its authorized but unissued shares of common stock a number of shares sufficient to effect the conversion of all outstanding shares of preferred stock (and preferred stock warrants), plus options granted and available for grant under the incentive plans.

	September 30, 2015		December 31, 2014
Conversion of outstanding Series A convertible preferred stock		—		252,817
Conversion of outstanding Series B redeemable convertible preferred stock		—		1,947,354
Conversion of outstanding Series B-1 redeemable convertible preferred stock		—		1,392,300
Conversion of outstanding Series C redeemable convertible preferred stock		—		2,487,770
Conversion of outstanding Series D redeemable convertible preferred stock		—		11,409,360
Outstanding preferred stock warrants		—		976,492
Outstanding and issued stock options		3,314,159		2,138,096
Shares reserved for future option grants		3,732,533		1,550,101
Shares reserved under the 2015 employee stock purchase plan		700,000		—
Total common stock reserved for issuance		7,746,692		22,154,290