Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Total	Series B Convertible Preferred Stock	Series C Convertible Preferred Stock	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning Balance at Dec. 31, 2019	$ (8,038)			$ 116	$ 18,356	$ (19)	$ (26,491)
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2019		11,155,506	6,032,170
Temporary Equity, Beginning Balance at Dec. 31, 2019		$ 26,560	$ 22,500
Beginning Balance, Shares at Dec. 31, 2019				11,613,737
Options exercised	1				1
Options exercised, Shares				1,017
Stock-based compensation	51				51
Change in fair value of NC Ohio Trust Warrants	220				220
Unrealized gain on marketable securities	73					73
Net loss	(4,648)						(4,648)
Ending Balance at Jun. 30, 2020	(12,341)			$ 116	18,628	54	(31,139)
Temporary equity, Ending Balance, Shares at Jun. 30, 2020		11,155,506	6,032,170
Temporary equity, Ending Balance at Jun. 30, 2020		$ 26,560	$ 22,500
Ending Balance, Shares at Jun. 30, 2020				11,614,754
Beginning Balance at Dec. 31, 2019	(8,038)			$ 116	18,356	(19)	(26,491)
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2019		11,155,506	6,032,170
Temporary Equity, Beginning Balance at Dec. 31, 2019		$ 26,560	$ 22,500
Beginning Balance, Shares at Dec. 31, 2019				11,613,737
Net loss	(17,680)
Ending Balance at Dec. 31, 2020	$ (23,562)			$ 116	20,493		(44,171)
Temporary equity, Ending Balance, Shares at Dec. 31, 2020		11,155,506	6,032,170
Temporary equity, Ending Balance at Dec. 31, 2020		$ 26,560	$ 22,500
Ending Balance, Shares at Dec. 31, 2020	11,635,094			11,635,094
Beginning Balance at Mar. 31, 2020	$ (10,075)			$ 116	18,325	(253)	(28,263)
Temporary Equity, Beginning Balance, Shares at Mar. 31, 2020		11,155,506	6,032,170
Temporary Equity, Beginning Balance at Mar. 31, 2020		$ 26,560	$ 22,500
Beginning Balance, Shares at Mar. 31, 2020				11,614,754
Stock-based compensation	83				83
Change in fair value of NC Ohio Trust Warrants	220				220
Unrealized gain on marketable securities	307					307
Net loss	(2,876)						(2,876)
Ending Balance at Jun. 30, 2020	(12,341)			$ 116	18,628	$ 54	(31,139)
Temporary equity, Ending Balance, Shares at Jun. 30, 2020		11,155,506	6,032,170
Temporary equity, Ending Balance at Jun. 30, 2020		$ 26,560	$ 22,500
Ending Balance, Shares at Jun. 30, 2020				11,614,754
Beginning Balance at Dec. 31, 2020	$ (23,562)			$ 116	20,493		(44,171)
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2020		11,155,506	6,032,170
Temporary Equity, Beginning Balance at Dec. 31, 2020		$ 26,560	$ 22,500
Beginning Balance, Shares at Dec. 31, 2020	11,635,094			11,635,094
Options exercised	$ 35				35
Options exercised, Shares	24,410			24,410
Warrants exercised	$ 410			$ 1	409
Warrants exercised, Shares				72,385
Stock-based compensation	1,250				1,250
Change in fair value of NC Ohio Trust Warrants	250				250
Net loss	(21,558)						(21,558)
Ending Balance at Jun. 30, 2021	$ (43,175)			$ 117	22,437		(65,729)
Temporary equity, Ending Balance, Shares at Jun. 30, 2021		11,155,506	6,032,170
Temporary equity, Ending Balance at Jun. 30, 2021		$ 26,560	$ 22,500
Ending Balance, Shares at Jun. 30, 2021	11,731,889			11,731,889
Beginning Balance at Mar. 31, 2021	$ (27,497)			$ 117	21,035		(48,649)
Temporary Equity, Beginning Balance, Shares at Mar. 31, 2021		11,155,506	6,032,170
Temporary Equity, Beginning Balance at Mar. 31, 2021		$ 26,560	$ 22,500
Beginning Balance, Shares at Mar. 31, 2021				11,673,135
Warrants exercised	333				333
Warrants exercised, Shares				58,754
Stock-based compensation	819				819
Change in fair value of NC Ohio Trust Warrants	250				250
Net loss	(17,080)						(17,080)
Ending Balance at Jun. 30, 2021	$ (43,175)			$ 117	$ 22,437		$ (65,729)
Temporary equity, Ending Balance, Shares at Jun. 30, 2021		11,155,506	6,032,170
Temporary equity, Ending Balance at Jun. 30, 2021		$ 26,560	$ 22,500
Ending Balance, Shares at Jun. 30, 2021	11,731,889			11,731,889