Stock Offering	12 Months Ended
Dec. 31, 2015
Stock Offering [Abstract]
Stock offering	Shelf Registration Statement On June 3, 2014, the Company filed a shelf registration statement on Form S-3 with the U.S. Securities and Exchange Commission ("SEC") to, from time to time, sell up to an aggregate of $125 million of any combination of its common stock, warrants, debt securities or units. On June 30, 2014, the registration statement was declared effective by the SEC. On April 23, 2015, the Company entered into an At-the-Market Equity Offering Sales Agreement (“Sales Agreement”) with Cowen and Company, LLC (“Cowen”) pursuant to which they could sell, up to an aggregate of $10.0 million in shares of common stock through Cowen, as sales agent. Under the Sales Agreement, the Company agreed to pay Cowen a commission equal to 3.0% of the gross proceeds from the sale of shares of our common stock. On June 11, 2015, the Company completed the sale of approximately $10.0 million of common stock and terminated the offering. Approximately 1.83 million shares were sold in the offering at an average share price of $5.46. The Company received net proceeds of $9.6 million after commissions and offering costs of $406,000. Due to a late Form 8-K filing by the Company on June 1, 2015, which was due by May 29, 2015, the Company is currently ineligible to use its shelf registration statement beginning on the filing date of this Annual Report on Form 10-K. The Company expects to again be eligible as of June 1, 2016.

Shelf Registration Statement

On June 3, 2014, the Company filed a shelf registration statement on Form S-3 with the U.S. Securities and Exchange Commission ("SEC") to, from time to time, sell up to an aggregate of $125 million of any combination of its common stock, warrants, debt securities or units. On June 30, 2014, the registration statement was declared effective by the SEC. On April 23, 2015, the Company entered into an At-the-Market Equity Offering Sales Agreement (“Sales Agreement”) with Cowen and Company, LLC (“Cowen”) pursuant to which they could sell, up to an aggregate of $10.0 million in shares of common stock through Cowen, as sales agent. Under the Sales Agreement, the Company agreed to pay Cowen a commission equal to 3.0% of the gross proceeds from the sale of shares of our common stock. On June 11, 2015, the Company completed the sale of approximately $10.0 million of common stock and terminated the offering. Approximately 1.83 million shares were sold in the offering at an average share price of $5.46. The Company received net proceeds of $9.6 million after commissions and offering costs of $406,000. Due to a late Form 8-K filing by the Company on June 1, 2015, which was due by May 29, 2015, the Company is currently ineligible to use its shelf registration statement beginning on the filing date of this Annual Report on Form 10-K. The Company expects to again be eligible as of June 1, 2016.