Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 21, 2019	Mar. 12, 2019	Jan. 18, 2019	Jan. 14, 2019	Jun. 30, 2015	Mar. 31, 2020	Mar. 31, 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]
Stock Issued During Period, Value, New Issues					$ 25,000
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