Common Stock

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Common Stock

5. Common Stock

In September 2015, we entered into a subscription agreement with certain affiliates of BVF Partners L.P., or, collectively, BVF. Pursuant to the Subscription Agreement, we issued to BVF an aggregate of 10,000,000 shares of common stock at a purchase price per share of $1.57. The shares of common stock were offered directly to BVF without a placement agent or underwriter. The net proceeds from the offering, after deducting offering expenses, were approximately $15.1 million.