Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				6 Months Ended
	Feb. 18, 2021	Feb. 16, 2021	Jul. 13, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Shareholders Equity [Line Items]
Net proceeds from sale of common stock	$ 12,200			$ 14,453
Issuance of common stock, net of fees				$ 14,453
Stock issued during period shares warrants exercised				428,907
Proceeds from warrant exercises				$ 4,200
Weighted average exercise price				$ 9.71
Stockholders' Equity total amount				$ 29,754	$ 31,373	$ 15,070	$ 16,011	$ 17,932	$ 21,086
Common Stock, shares issued				6,960,000		4,542,000
Common Stock, shares outstanding				6,960,000		4,542,000
Preferred Stock, shares issued				0		0
Preferred Stock, shares outstanding				0		0
Common Stock
Shareholders Equity [Line Items]
Shares issued (in shares)				1,989,000
Issuance of common stock, net of fees				$ 2
Stockholders' Equity total amount				7	$ 7	$ 5	$ 4	$ 4	$ 4
IPO [Member]
Shareholders Equity [Line Items]
Shares issued (in shares)		1,710,600
Net proceeds from sale of common stock		$ 13,000
2021 Public Offering [Member]
Shareholders Equity [Line Items]
Shares issued (in shares)		1,650,000
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%
Stockholders' Equity total amount				$ 29,800		$ 15,100
At-The-Market Offering Agreement [Member] | Common Stock
Shareholders Equity [Line Items]
Shares issued (in shares)				278,800
Net proceeds				$ 2,300
Common Stock, shares issued				6,960,164
Common Stock, shares outstanding				6,960,164
At-The-Market Offering Agreement [Member] | Preferred Stock
Shareholders Equity [Line Items]
Preferred Stock, shares issued				0
Preferred Stock, shares outstanding				0