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Stockholders' Equity - Common Stock (Details) - USD ($)				3 Months Ended			10 Months Ended
	Sep. 21, 2018	Jul. 25, 2018	Jun. 01, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2019
Common Stock [Abstract]
Proceeds from sale of common stock, net				$ 1,919,000		$ (150,000)
Common stock issued (in shares)		6,723
Common stock issued, value				$ 1,873,000		$ 27,000
Common Stock [Member]
Common Stock [Abstract]
Common stock issued (in shares)		6,723		6,992,736		10,069
Common stock issued, value				$ 7,000
Common Stock [Member] | B. Riley FBR [Member] | Sales Agreement [Member]
Common Stock [Abstract]
Proceeds from sale of common stock, net							$ 3,800,000
Common stock issued (in shares)							11,000,000
Common Stock [Member] | B. Riley FBR [Member] | Sales Agreement [Member] | Maximum [Member]
Common Stock [Abstract]
Proceeds from sale of common stock, net			$ 6,500,000
Common Stock [Member] | B. Riley FBR [Member] | ATM Program [Member] | Sales Agreement [Member]
Common Stock [Abstract]
Proceeds from sale of common stock, net							$ 3,800,000
Common stock issued (in shares)							11,000,000
Common Stock [Member] | B. Riley FBR [Member] | ATM Program [Member] | Sales Agreement [Member] | Maximum [Member]
Common Stock [Abstract]
Proceeds from sale of common stock, net			$ 6,500,000
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member]
Common Stock [Abstract]
Common stock issued (in shares)				0
Common stock issued, value	$ 5,000,000
Period exercisable from the date of issuance	24 months
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Securities Purchase Agreement [Member]
Common Stock [Abstract]
Trading Volume of Common Shares	0
Upper Limit on the Price Per Share	$ 0
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Maximum [Member]
Common Stock [Abstract]
Beneficial ownership percentage of common stock outstanding	4.99%
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Maximum [Member] | Single Regular Purchase [Member]
Common Stock [Abstract]
Common stock issued (in shares)	250,000
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Minimum [Member] | Single Regular Purchase [Member]
Common Stock [Abstract]
Common stock issued, value	$ 1,000,000
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member]
Common Stock [Abstract]
Proceeds from sale of common stock, net					$ 300,000
Common stock issued (in shares)					600,000
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member] | Maximum [Member]
Common Stock [Abstract]
Floor price of per share	$ 0.25

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