Stockholders' Equity	3 Months Ended
Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity	11. Stockholders’ Equity Preferred Stock The Company currently has 50,000,000 shares of preferred stock authorized. Series A Convertible Preferred Stock During the three months ended March 31, 2019, the Company did not issue dividends of Series A convertible preferred stock to the holders of the Series A convertible preferred stock. As of March 31, 2019, dividends in arrears were $8. Common Stock As of March 31, 2019, the Company has reserved 15,312,223 shares of common stock for future issuances related to employee stock compensation plans. On April 10, 2018, the Company completed a public offering of 3,450,000 shares of its common stock, including 450,000 shares sold upon exercise in full of the underwriters’ option to purchase additional shares, at a price of $8.60 per share. The Company received net proceeds of approximately $28,000 after deducting underwriters’ discounts and commissions and offering costs. On April 13, 2018, the Company filed a shelf registration statement with the SEC, registering an unspecified amount of debt and/or equity securities that the Company may offer in one or more offerings on terms to be determined at the time of sale. The shelf registration statement was automatically effective upon filing and superseded and replaced the Company’s previous shelf registration statement declared effective on April 14, 2015, which was due to expire on April 14, 2018.

Stockholders' Equity

3 Months Ended

Mar. 31, 2019

11. Stockholders’ Equity

Preferred Stock

The Company currently has 50,000,000 shares of preferred stock authorized.

Series A Convertible Preferred Stock

During the three months ended March 31, 2019, the Company did not issue dividends of Series A convertible preferred stock to the holders of the Series A convertible preferred stock. As of March 31, 2019, dividends in arrears were $8.

Common Stock

As of March 31, 2019, the Company has reserved 15,312,223 shares of common stock for future issuances related to employee stock compensation plans.

On April 10, 2018, the Company completed a public offering of 3,450,000 shares of its common stock, including 450,000 shares sold upon exercise in full of the underwriters’ option to purchase additional shares, at a price of $8.60 per share. The Company received net proceeds of approximately $28,000 after deducting underwriters’ discounts and commissions and offering costs.

On April 13, 2018, the Company filed a shelf registration statement with the SEC, registering an unspecified amount of debt and/or equity securities that the Company may offer in one or more offerings on terms to be determined at the time of sale. The shelf registration statement was automatically effective upon filing and superseded and replaced the Company’s previous shelf registration statement declared effective on April 14, 2015, which was due to expire on April 14, 2018.