Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Jul. 13, 2020	Nov. 21, 2019	Mar. 12, 2019	Jan. 18, 2019	Jan. 14, 2019	Dec. 31, 2020	Dec. 31, 2019
Shareholders Equity [Line Items]
Proceeds from Issuance of Common Stock			$ 17,000	$ 1,500	$ 900	$ 4,289	$ 26,700
Issuance of common stock, net of fees				$ 1,700		$ 4,289	$ 26,700
Stock Issued During Period Shares Warrants Exercised							409,875
Proceeds from Warrant Exercises							$ 1,100
Weighted Average Exercise Price							$ 2.67
Warrant [Member]
Shareholders Equity [Line Items]
Proceeds from Issuance of Common Stock		$ 7,300
Warrants issued			42,775
Common Stock
Shareholders Equity [Line Items]
Shares issued (in shares)						850,000	2,602,000
Issuance of common stock, net of fees						$ 1	$ 3
Stock Issued During Period, Shares, New Issues						850,000	2,602,000
IPO [Member]
Shareholders Equity [Line Items]
Shares issued (in shares)					429,616
Proceeds from Issuance of Common Stock					$ 1,100
Shares Issued, Price Per Share					$ 2.60
Stock Issued During Period, Shares, New Issues					429,616
2019 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Shares issued (in shares)		808,080	712,910	648,233
Issuance of common stock, net of fees		$ 8,000	$ 18,500
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				324,117
Stock Issued During Period, Shares, New Issues		808,080	712,910	648,233
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
At-The-Market Offering Agreement [Member]
Shareholders Equity [Line Items]
Maximum aggregate offering price	$ 7,000
Commission on aggregate gross proceeds (as a percent)	3.00%
At-The-Market Offering Agreement [Member] | Common Stock
Shareholders Equity [Line Items]
Shares issued (in shares)						850,000
Proceeds from Issuance of Common Stock						$ 4,600
Stock Issued During Period, Shares, New Issues						850,000
Net proceeds						$ 4,300
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