Private Placement	9 Months Ended
Private Placement	Sep. 30, 2019
Equity [Abstract]
Private Placement	Private Placements Common Stock On August 6, 2018, the Company completed a private placement of 12,062,000 shares of common stock, par value $0.001 per share, and warrants to purchase an additional 4,221,700 shares of common stock (the “2018 Warrants”), subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, to certain accredited investors for gross proceeds of $19.7 million in cash. In connection with the private placement, the Company incurred issuance costs of approximately $0.5 million. On March 28, 2019, the 2018 Warrants were exercised at an exercise price of $2.52 per share, for aggregate cash proceeds to the Company of approximately $10.6 million. In connection with the exercise of the 2018 Warrants, on March 28, 2019, the Company issued additional warrants to purchase 2,500,000 shares of common stock (the “2019 Warrants”) to the accredited investors. Each 2019 Warrant has an initial exercise price of $7.00 per share, subject to adjustment for stock splits, reverse stock splits, stock dividends and similar transactions, will be exercisable at any time on or after September 28, 2019, and will expire on June 30, 2022. The 2019 Warrants may be exercisable on a cashless exercise basis if, and only if, the shares of common stock underlying such warrants cannot be immediately resold pursuant to an effective registration statement or Rule 144 of the Securities Act of 1933, as amended, without volume or manner of sale restrictions. The Company assessed the terms of the warrants under ASC 815, Derivatives and Hedges. Pursuant to this guidance, the Company has determined that the warrants do not require liability accounting and has classified the warrants as equity. Preferred Stock On August 9, 2019, the Company completed a private placement of 10,000 shares of Series E Preferred Stock for an aggregate purchase price of $10.0 million in accordance with the terms and provisions of a Securities Purchase Agreement, dated August 9, 2019, by and among the Company and certain accredited investors. Each share of Series E Preferred Stock entitles the holder thereof to receive, when, as and if declared by the Company out of assets legally available therefor, cumulative cash dividends at an annual rate of 9.00% payable quarterly in arrears on January 1, April 1, July 1 and October 1 of each year, beginning on October 1, 2019. If dividends are not declared and paid in any quarter, or if such dividends are declared but holders of the Series E Preferred Stock elect not to receive them in cash, the quarterly dividend will be deemed to accrue and will be added to the Series E Base Amount. The Series E Preferred Stock has no voting rights unless otherwise required by law. The Series E Preferred Stock is perpetual and has no maturity date. However, the Company may, at its option, redeem shares of the Series E Preferred Stock, in whole or in part, on or after July 1, 2022, at a price equal to 110% of the Series E Base Amount plus (without duplication) any accrued and unpaid dividends. The “Series E Base Amount” means $1,000 per share, plus any accrued but unpaid dividends, whether or not declared by the Company’s board of directors, subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization with respect to the Series E Preferred Stock. In the event of a liquidation, dissolution or winding up of the Company, the holders of the Series E Preferred Stock will be entitled to receive, after satisfaction of liabilities to creditors and subject to the rights of holders of any senior securities, but before any distribution of assets is made to holders of common stock or any other junior securities, the Series E Base Amount plus (without duplication) any accrued and unpaid dividends.