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Private Placements and Public Offering	6 Months Ended
Private Placements and Public Offering	Jun. 30, 2021
Equity [Abstract]
Private Placements and Public Offering	Private Placements and Public Offering 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. 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, became exercisable on September 28, 2019, and will expire on June 30, 2022. During the first quarter of 2020, the Company received $1.9 million in net cash proceeds from the exercise of 338,454 of the Company’s common stock purchase warrants issued in 2015. The Company assessed the terms of the warrants under ASC 815. Pursuant to this guidance, the Company has determined that the warrants do not require liability accounting and has classified the warrants as equity. On January 25, 2021, the Company entered into an Equity Distribution Agreement with the Agent, pursuant to which the Company may offer and sell, from time to time, through or to the Agent, up to $40.0 million of shares of its common stock. In January 2021, the Company sold 1,516,073 shares of common stock, at an average price of $20.11 per share, for net proceeds of $29.4 million, after deducting underwriter fees and discounts, and other offering fees, pursuant to the ATM Offering. Preferred Stock On March 6, 2020, the Company issued and sold an additional 25,000 shares of Series E Preferred Stock for an aggregate purchase price of $25.0 million. On March 31, 2020, the Company issued 2,330 shares of Series E Preferred Stock to South Ocean, in satisfaction of certain deferred interest obligations pursuant to the terms and conditions of the Credit Agreement. On May 12, 2020, the Company used a portion of the proceeds from the Offering to repurchase the 2,330 shares of Series E Preferred Stock, which had been issued to satisfy accrued interest under the Credit Agreement, for $2.4 million.