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Private Placement	6 Months Ended
	Jun. 30, 2019
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 (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.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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