Stockholders' Equity

3 Months Ended

Mar. 31, 2016

Stockholders Equity Note [Abstract]

Stockholders' Equity

7. Stockholders’ Equity

Common Stock Reserved for Issuance

The Company has reserved shares of common stock for issuance as follows:

	March 31, 2016		December 31, 2015
Options issued and outstanding		1,910,181		1,318,647
Shares available for issuance under 2015 Stock Option and Incentive Plan		942,611		1,497,071
Shares available for issuance under 2015 Employee Stock Purchase Plan		255,000		255,000
Total		3,107,792		3,070,718

Redeemable Convertible Preferred Stock

Prior to the IPO in October 2015, the Company had 62,235,313 shares of redeemable convertible preferred stock outstanding with a par value of $0.0001 per share, of which 38,500,000 were designated Series A redeemable convertible preferred stock, 6,666,667 were designated Series A-1 redeemable convertible preferred stock, and 17,068,646 were designated Series B redeemable convertible preferred stock. As disclosed in the Company’s Form 10-K for the year ended December 31, 2015, the Company accreted redeemable convertible preferred stock to redemption value and also accreted dividends in relation to these shares of redeemable convertible preferred stock. For the three months ended March 31, 2015, the Company accreted redeemable convertible preferred stock to redemption value by $33,000 and accreted dividends on redeemable convertible preferred stock of $952,000.