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Common Stock
 3 Months Ended
Mar. 31, 2016
Preferred Stock Common Stock And Warrants [Abstract]  
Common Stock

7. Common Stock

Common Stock Outstanding

As of March 31, 2016, there were 38,495,502 shares of our common stock outstanding.

On November 12, 2015, we entered into an At Market Issuance Sales Agreement (the “2015 ATM Agreement”) with Cowen under which we could offer and sell our common stock from time to time up to aggregate sales proceeds of $90 million through Cowen as our sales agent. As of March 31, 2016, we have sold no shares of common stock under the 2015 ATM Agreement.