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Stockholders' Equity
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Stockholders' Equity
Stockholders' Equity

On April 26, 2017, the Company entered into a definitive agreement with an institutional healthcare investor to purchase 1,100,000 shares of its common stock at a purchase price of $21.50 per share in a registered direct offering. Proceeds to the Company, before deducting estimated offering expenses, were $23.7 million. The shares were offered pursuant to the Company’s effective shelf registration on Form S-3 that was filed with the SEC on November 2, 2016.

On May 3, 2017, the Company entered into a sales agreement with an agent to sell, from time to time, shares of its common stock having an aggregate sales price of up to $75.0 million through an “at the market offering” (ATM Offering) as defined in Rule 415 under the Securities Act of 1933, as amended. The shares that may be sold under the sales agreement would be issued and sold pursuant to the Company's shelf registration statement on Form S-3 that was filed with the SEC on November 2, 2016. During the three and nine months ended September 30, 2017, the Company sold 62,342 and 599,284 shares of common stock under the sales agreement, respectively, resulting in net proceeds of $1.1 million and $10.8 million, respectively, related to the ATM Offering.