Equity	12 Months Ended
Dec. 31, 2016
Equity [Abstract]
Equity	Equity Common Stock - 2015 Follow-on Public Offering On July 27, 2015, the Company completed an underwritten public offering of shares of the Company's common stock at a price per share of $5.80 per share (the 2015 Offering). The shares sold in the 2015 Offering included 2,586,206 shares of common stock plus an additional 387,930 shares of common stock pursuant to the exercise by the underwriters of the over-allotment option the Company granted to them. Total gross proceeds to the Company in the 2015 Offering (including the sale of shares of common stock pursuant to the exercise of the over-allotment option) totaled $17.3 million, and resulted in net proceeds of approximately $15.9 million after the deduction of underwriting discounts and other offering expenses. Common Stock - "At-The-Market" Equity Program In January 2016, the Company entered into a Controlled Equity Offering™ Sales Agreement (the ATM Agreement) with Cantor Fitzgerald & Co. (Cantor Fitzgerald) to implement an "At-The-Market" (ATM) equity program under which the Company, from time to time, may offer and sell shares of its common stock having an aggregate offering price of up to $50.0 million (the Shares) through Cantor Fitzgerald. Subject to the terms and conditions of the Agreement, Cantor Fitzgerald will use its commercially reasonable efforts to sell the Shares from time to time, based upon the Company’s instructions. The Company has no obligation to sell any of the Shares, and may at any time suspend sales under the ATM Agreement or terminate the ATM Agreement. Cantor Fitzgerald is entitled to a fixed commission of up to 3.0% of the gross proceeds from Shares sold. Through December 31, 2016, 159,841 Shares have been sold through the ATM equity program, resulting in no net proceeds to date after the deduction of commissions and other offering expenses. Common Stock - Shares Authorized In July 2016, the Company amended its Restated Certificate of Incorporation, as amended, to increase the number of shares of common stock that the Company is authorized to issue from 100,000,000 to 150,000,000. Preferred Stock The Company is authorized to issue 5,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges, and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The issuance of the Company’s preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change of control of the Company or other corporate action. There were no preferred shares issued or outstanding as of December 31, 2016 or December 31, 2015.

Equity

12 Months Ended

Dec. 31, 2016

Common Stock - 2015 Follow-on Public Offering

On July 27, 2015, the Company completed an underwritten public offering of shares of the Company's common stock at a price per share of $5.80 per share (the 2015 Offering). The shares sold in the 2015 Offering included 2,586,206 shares of common stock plus an additional 387,930 shares of common stock pursuant to the exercise by the underwriters of the over-allotment option the Company granted to them. Total gross proceeds to the Company in the 2015 Offering (including the sale of shares of common stock pursuant to the exercise of the over-allotment option) totaled $17.3 million, and resulted in net proceeds of approximately $15.9 million after the deduction of underwriting discounts and other offering expenses.

Common Stock - "At-The-Market" Equity Program

In January 2016, the Company entered into a Controlled Equity Offering™ Sales Agreement (the ATM Agreement) with Cantor Fitzgerald & Co. (Cantor Fitzgerald) to implement an "At-The-Market" (ATM) equity program under which the Company, from time to time, may offer and sell shares of its common stock having an aggregate offering price of up to $50.0 million (the Shares) through Cantor Fitzgerald.

Subject to the terms and conditions of the Agreement, Cantor Fitzgerald will use its commercially reasonable efforts to sell the Shares from time to time, based upon the Company’s instructions. The Company has no obligation to sell any of the Shares, and may at any time suspend sales under the ATM Agreement or terminate the ATM Agreement. Cantor Fitzgerald is entitled to a fixed commission of up to 3.0% of the gross proceeds from Shares sold. Through December 31, 2016, 159,841 Shares have been sold through the ATM equity program, resulting in no net proceeds to date after the deduction of commissions and other offering expenses.

Common Stock - Shares Authorized

In July 2016, the Company amended its Restated Certificate of Incorporation, as amended, to increase the number of

shares of common stock that the Company is authorized to issue from 100,000,000 to 150,000,000.

Preferred Stock

The Company is authorized to issue 5,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges, and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The issuance of the Company’s preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change of control of the Company or other corporate action. There were no preferred shares issued or outstanding as of December 31, 2016 or December 31, 2015.