Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands					6 Months Ended		12 Months Ended
	Nov. 21, 2019	Mar. 12, 2019	Jan. 18, 2019	Jan. 14, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Shareholders Equity [Line Items]
Stock Issued During Period, Value, New Issues						$ 19,411
Proceeds from Issuance of Common Stock		$ 17,000	$ 1,500	$ 900	$ 0	$ 19,411
Stock Issued During Period Shares Warrants Exercised							409,875
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 2.67
Proceeds from Warrant Exercises							$ 1,100
Warrant [Member]
Shareholders Equity [Line Items]
Proceeds from Issuance of Common Stock	$ 7,300
Warrants issued		42,775
Common Stock
Shareholders Equity [Line Items]
Stock Issued During Period, Shares, New Issues						1,794,000
Stock Issued During Period, Value, New Issues						$ 2
IPO [Member]
Shareholders Equity [Line Items]
Stock Issued During Period, Shares, New Issues				429,616
Proceeds from Issuance of Common Stock				$ 1,100
Shares Issued, Price Per Share				$ 2.60
2019 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Stock Issued During Period, Shares, New Issues	808,080	712,910	648,233
Stock Issued During Period, Value, New Issues	$ 8,000	$ 18,500	$ 1,700
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			324,117
2019 Registered Direct Offering [Member] | Warrant [Member]
Shareholders Equity [Line Items]
Warrants issued	606,060
Private Placement [Member]
Shareholders Equity [Line Items]
Warrants issued				25,777
HC Wainwright Co [Member]
Shareholders Equity [Line Items]
Shares Issued, Price Per Share				$ 2.418
HC Wainwright Co [Member] | 2019 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Warrants issued	48,485
HC Wainwright Co [Member] | Private Placement [Member] | Common Stock
Shareholders Equity [Line Items]
Warrants issued			38,894