Stockholders’ equity	12 Months Ended
Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Common Stock Pursuant to the Company’s amended and restated certificate of incorporation (“Certificate of Incorporation”), the Company is authorized to issue up to 100,000,000 shares of common stock, par value $0.01 per share. As of December 31, 2017, there were 50,598,901 shares of common stock issued and outstanding. Preferred Stock Pursuant to the Company’s Certificate of Incorporation, the Company is authorized to issue up to 5,000,000 shares of preferred stock, par value $0.01 per share. The Board of Directors (“BODs”) has the authority, subject to any limitations imposed by law or NASDAQ rules, without further action by the stockholders, to issue such preferred stock in one or more series and to fix the voting powers (if any), the preferences and relative, participating, optional or other special rights or privileges, if any, of such series and the qualifications, limitations or restrictions thereof. These rights, preferences and privileges may include, but are not limited to, 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 that series. As of December 31, 2017, there were no shares of preferred stock issued and outstanding. Share Repurchase Program In March 2016, the Company’s BODs authorized a share repurchase program of up to 1,000,000 shares of its common stock through 2017. The share repurchase program expired in 2017. No shares were repurchased during the years ended December 31, 2017 and 2016. Section 382 Transfer Restrictions If we were to experience an ownership change, Section 382 of the Internal Revenue Code imposes an annual limitation which could impact the utilization of our net operating loss carryforwards. To reduce the likelihood of such an ownership change, our BODs implemented certain transfer restrictions, including Article V of the Company’s Certificate of Incorporation, and a Section 382 rights agreement regarding preservation of our net operating loss carryforwards. On March 27, 2014, the BODs declared a dividend of one preferred share purchase right, with respect to each outstanding share of common stock of the Company, to purchase from the Company one one-thousandth of a share of Series B Junior Participating Preferred Stock, par value $0.01 per share, of the Company at a price of $30.00 per one one-thousandth of a share of preferred stock, subject to adjustment as provided in the Section 382 rights agreement. The dividend was payable to stockholders of record at the close of business on April 7, 2014. As of December 31, 2017, the rights agreement has not been triggered.

Common Stock

Pursuant to the Company’s amended and restated certificate of incorporation (“Certificate of Incorporation”), the Company is authorized to issue up to 100,000,000 shares of common stock, par value $0.01 per share. As of December 31, 2017, there were 50,598,901 shares of common stock issued and outstanding.

Preferred Stock

Pursuant to the Company’s Certificate of Incorporation, the Company is authorized to issue up to 5,000,000 shares of preferred stock, par value $0.01 per share. The Board of Directors (“BODs”) has the authority, subject to any limitations imposed by law or NASDAQ rules, without further action by the stockholders, to issue such preferred stock in one or more series and to fix the voting powers (if any), the preferences and relative, participating, optional or other special rights or privileges, if any, of such series and the qualifications, limitations or restrictions thereof. These rights, preferences and privileges may include, but are not limited to, 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 that series. As of December 31, 2017, there were no shares of preferred stock issued and outstanding.

Share Repurchase Program

In March 2016, the Company’s BODs authorized a share repurchase program of up to 1,000,000 shares of its common stock through 2017. The share repurchase program expired in 2017. No shares were repurchased during the years ended December 31, 2017 and 2016.

Section 382 Transfer Restrictions

If we were to experience an ownership change, Section 382 of the Internal Revenue Code imposes an annual limitation which could impact the utilization of our net operating loss carryforwards. To reduce the likelihood of such an ownership change, our BODs implemented certain transfer restrictions, including Article V of the Company’s Certificate of Incorporation, and a Section 382 rights agreement regarding preservation of our net operating loss carryforwards. On March 27, 2014, the BODs declared a dividend of one preferred share purchase right, with respect to each outstanding share of common stock of the Company, to purchase from the Company one one-thousandth of a share of Series B Junior Participating Preferred Stock, par value $0.01 per share, of the Company at a price of $30.00 per one one-thousandth of a share of preferred stock, subject to adjustment as provided in the Section 382 rights agreement. The dividend was payable to stockholders of record at the close of business on April 7, 2014. As of December 31, 2017, the rights agreement has not been triggered.