Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Initial Public Offering [Member]	Common Stock	Common Stock Initial Public Offering [Member]	Additional Paid-in Capital	Additional Paid-in Capital Initial Public Offering [Member]	Accumulated Deficit
Beginning Balance at Dec. 31, 2018	$ 11,015		$ 1		$ 58,431		$ (47,417)
Beginning Balance, Shares at Dec. 31, 2018			10,000,000
Stock-based compensation expense	1,379				1,379
Net loss	(6,607)						(6,607)
Issuance of common stock net of underwriting discounts and commissions and other offering costs		$ 56,353		$ 1		$ 56,352
Issuance of common stock upon net of underwriting discounts and commissions and other offerings costs, Shares				4,945,000
Issuance of shares upon vesting of restricted stock units, net of tax withholdings, Shares			23,000
Ending Balance at Dec. 31, 2019	$ 62,140		$ 2		116,162		(54,024)
Ending Balance, Shares at Dec. 31, 2019	14,968,000		14,968,000
Stock-based compensation expense	$ 14,816				14,816
Net loss	(9,372)						(9,372)
Issuance of common stock net of underwriting discounts and commissions and other offering costs	45,789				45,789
Issuance of common stock upon net of underwriting discounts and commissions and other offerings costs, Shares			1,525,000
Issuance of shares upon vesting of restricted stock units, net of tax withholdings	(3,493)				(3,493)
Issuance of shares upon vesting of restricted stock units, net of tax withholdings, Shares			657,000
Ending Balance at Dec. 31, 2020	$ 109,880		$ 2		$ 173,274		$ (63,396)
Ending Balance, Shares at Dec. 31, 2020	17,150,000		17,150,000