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Private Placement	9 Months Ended
Private Placement	Sep. 30, 2018
Equity [Abstract]
Private Placement	Private Placement 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, 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. Each warrant has an initial exercise price of $2.52 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 February 6, 2019, and will expire on August 6, 2023. The 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. In connection with the private placement, the Company incurred issuance costs of approximately $0.5 million. 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.