Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	ATM	Common Stock	Common Stock ATM	Additional Paid-in Capital	Additional Paid-in Capital ATM	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Dec. 31, 2019	$ 41,848		$ 1		$ 82,938		$ 21	$ (41,112)
Balance, Shares at Dec. 31, 2019			17,425,654
Issuance of common stock	252	$ 825			252	$ 825
Issuance of common stock, Shares			83,662	174,649
Vesting of restricted stock liability	18				18
Stock-based compensation expense	787				787
Other comprehensive income	453						453
Net loss	(7,837)							(7,837)
Balance at Mar. 31, 2020	36,346		$ 1		84,820		474	(48,949)
Balance, Shares at Mar. 31, 2020			17,683,965
Balance at Dec. 31, 2020	69,854		$ 2		141,074		(297)	(70,925)
Balance, Shares at Dec. 31, 2020			24,753,102
Issuance of common stock under registered direct offering, net of offering costs	29,909				29,909
Issuance of common stock under registered direct offering, net of offering costs, Shares			4,285,710
Exercise of stock options	4				4
Exercise of stock options, Shares			1,458
Vesting of restricted stock liability	18				18
Stock-based compensation expense	1,044				1,044
Other comprehensive income	42						42
Net loss	(8,991)							(8,991)
Balance at Mar. 31, 2021	$ 91,880		$ 2		$ 172,049		$ (255)	$ (79,916)
Balance, Shares at Mar. 31, 2021			29,040,270