Equity	6 Months Ended
Jun. 30, 2016
Equity [Abstract]
Equity	Equity 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. The amendment was approved by stockholders in June at the Company’s 2016 Annual Meeting of Stockholders. 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 ATM 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 will be entitled to a fixed commission of up to 3.0% of the gross proceeds from Shares sold. Through June 30, 2016, no Shares have been sold through the ATM equity program.

Equity

6 Months Ended

Jun. 30, 2016

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. The amendment was approved by stockholders in June at the Company’s 2016 Annual Meeting of Stockholders.

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 ATM 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 will be entitled to a fixed commission of up to 3.0% of the gross proceeds from Shares sold. Through June 30, 2016, no Shares have been sold through the ATM equity program.