Redeemable Preferred Stock	6 Months Ended
Jun. 30, 2018
Redeemable Preferred Stock
Redeemable Preferred Stock	10. Redeemable Convertible Preferred Stock In December 2016, the Company completed an offering of an aggregate of 18,500 shares of the Company’s Series D Redeemable Preferred Stock, par value $0.01 per share (Series D Preferred Stock) and warrants to purchase 7,381,500 shares of the Company’s common stock, par value $0.01 per share (Common Stock), resulting in aggregate proceeds of approximately $15.6 million. During the three months ended March 31, 2017, the Company redeemed 3,700 shares of the Series D Preferred Stock, at an aggregate redemption price of approximately $3.7 million. On April 5, 2017, all of the remaining outstanding shares of the Series D Preferred Stock were converted into an aggregate of 9,548,393 shares of the Company’s common stock at a conversion price of $1.55. The conversion was done at the election of the holder in accordance with the terms of the offering. After the conversion, no shares of Series D Preferred Stock remain outstanding. In December 2017, the series was deauthorized by the Board of Directors. During the third quarter of 2017, 2,611 shares of the Company’s Series C Redeemable Preferred Stock, par value $0.01 per share (Series C Preferred Stock) were converted to common stock. At June 30, 2018, there were 2,620 shares of Series C Preferred Stock outstanding. In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, or other deemed liquidation event, as defined in the Securities Purchase Agreement, the holder of the Series C Redeemable Preferred Stock will be entitled to be paid an amount per share equal to the greater of (i) the original issue price, plus any accrued but unpaid dividends or (ii) the amount per share that would have been payable had all shares of the Series C Redeemable Preferred Stock been converted to shares of common stock immediately prior to such liquidation event. The Series C Redeemable Preferred Stock is redeemable at the election of the holder of the Series C Redeemable Preferred Stock or the Company. The holder of the Series C Redeemable Preferred Stock is entitled to receive dividends at a rate of 8% per annum, based on the original issue price per share of $248.794, payable in equal quarterly installments in cash or in shares of common stock, at the Company’s option. During the six months ended June 30, 2018 and 2017, respectively, dividends have been paid in the form of shares of common stock. Each share of Series C Redeemable Preferred Stock is convertible into shares of common stock with the number of shares of common stock issuable upon conversion determined by dividing the original issue price per share of $248.794 by the conversion price in effect at the time the shares are converted. The conversion price of the Series C Redeemable Preferred Stock as of June 30, 2018 and December 31, 2017 was $0.2343. The Series C Redeemable Preferred Stock votes together with the common stock on an as-converted basis on all matters.

10. Redeemable Convertible Preferred Stock

In December 2016, the Company completed an offering of an aggregate of 18,500 shares of the Company’s Series D Redeemable Preferred Stock, par value $0.01 per share (Series D Preferred Stock) and warrants to purchase 7,381,500 shares of the Company’s common stock, par value $0.01 per share (Common Stock), resulting in aggregate proceeds of approximately $15.6 million. During the three months ended March 31, 2017, the Company redeemed 3,700 shares of the Series D Preferred Stock, at an aggregate redemption price of approximately $3.7 million. On April 5, 2017, all of the remaining outstanding shares of the Series D Preferred Stock were converted into an aggregate of 9,548,393 shares of the Company’s common stock at a conversion price of $1.55. The conversion was done at the election of the holder in accordance with the terms of the offering. After the conversion, no shares of Series D Preferred Stock remain outstanding. In December 2017, the series was deauthorized by the Board of Directors.

During the third quarter of 2017, 2,611 shares of the Company’s Series C Redeemable Preferred Stock, par value $0.01 per share (Series C Preferred Stock) were converted to common stock. At June 30, 2018, there were 2,620 shares of Series C Preferred Stock outstanding.

In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, or other deemed liquidation event, as defined in the Securities Purchase Agreement, the holder of the Series C Redeemable Preferred Stock will be entitled to be paid an amount per share equal to the greater of (i) the original issue price, plus any accrued but unpaid dividends or (ii) the amount per share that would have been payable had all shares of the Series C Redeemable Preferred Stock been converted to shares of common stock immediately prior to such liquidation event. The Series C Redeemable Preferred Stock is redeemable at the election of the holder of the Series C Redeemable Preferred Stock or the Company.

The holder of the Series C Redeemable Preferred Stock is entitled to receive dividends at a rate of 8% per annum, based on the original issue price per share of $248.794, payable in equal quarterly installments in cash or in shares of common stock, at the Company’s option. During the six months ended June 30, 2018 and 2017, respectively, dividends have been paid in the form of shares of common stock. Each share of Series C Redeemable Preferred Stock is convertible into shares of common stock with the number of shares of common stock issuable upon conversion determined by dividing the original issue price per share of $248.794 by the conversion price in effect at the time the shares are converted. The conversion price of the Series C Redeemable Preferred Stock as of June 30, 2018 and December 31, 2017 was $0.2343. The Series C Redeemable Preferred Stock votes together with the common stock on an as-converted basis on all matters.