Condensed Consolidated Statements of Mezzanine Equity and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Subscription Receivable	Additional Paid In Capital	Accumulated Deficit	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Accumulated Deficit	Redeemable Convertible Preferred Stock
Beginning Balance at Dec. 31, 2018								$ 54,170
Beginning Balance, Shares at Dec. 31, 2018								31,968,570
Beginning Balance at Dec. 31, 2018	$ (39,446)	$ 6	$ (758)	$ 1,430	$ (40,124)	$ 104	$ 104
Beginning Balance, Shares at Dec. 31, 2018		6,310,865
Options exercised for common stock	11			11
Options exercised for common stock, Shares		50,806
Interest earned on subscription receivable	(4)		(4)
Share based compensation expense	91			91
Net income (loss)	(948)				(948)
Ending Balance at Mar. 31, 2019								$ 54,170
Ending Balance, Shares at Mar. 31, 2019								31,968,570
Ending Balance at Mar. 31, 2019	(40,192)	$ 6	(762)	1,532	(40,968)
Ending Balance, Shares at Mar. 31, 2019		6,361,671
Beginning Balance at Dec. 31, 2018								$ 54,170
Beginning Balance, Shares at Dec. 31, 2018								31,968,570
Beginning Balance at Dec. 31, 2018	(39,446)	$ 6	(758)	1,430	(40,124)	$ 104	$ 104
Beginning Balance, Shares at Dec. 31, 2018		6,310,865
Net income (loss)	(1,547)
Ending Balance at Sep. 30, 2019								$ 54,170
Ending Balance, Shares at Sep. 30, 2019								31,968,570
Ending Balance at Sep. 30, 2019	(40,375)	$ 6	(663)	1,849	(41,567)
Ending Balance, Shares at Sep. 30, 2019		6,622,129
Beginning Balance at Mar. 31, 2019								$ 54,170
Beginning Balance, Shares at Mar. 31, 2019								31,968,570
Beginning Balance at Mar. 31, 2019	(40,192)	$ 6	(762)	1,532	(40,968)
Beginning Balance, Shares at Mar. 31, 2019		6,361,671
Options exercised for common stock	9			9
Options exercised for common stock, Shares		31,173
Interest earned on subscription receivable	(4)		(4)
Share based compensation expense	99			99
Net income (loss)	(965)				(965)
Ending Balance at Jun. 30, 2019								$ 54,170
Ending Balance, Shares at Jun. 30, 2019								31,968,570
Ending Balance at Jun. 30, 2019	(41,053)	$ 6	(766)	1,640	(41,933)
Ending Balance, Shares at Jun. 30, 2019		6,392,844
Options exercised for common stock	70			70
Options exercised for common stock, Shares		229,285
Interest earned on subscription receivable	(4)		(4)
Proceeds from subscription receivable	107		107
Share based compensation expense	139			139
Net income (loss)	366				366
Ending Balance at Sep. 30, 2019								$ 54,170
Ending Balance, Shares at Sep. 30, 2019								31,968,570
Ending Balance at Sep. 30, 2019	(40,375)	$ 6	$ (663)	1,849	(41,567)
Ending Balance, Shares at Sep. 30, 2019		6,622,129
Beginning Balance at Dec. 31, 2019	$ 54,170							$ 54,170
Beginning Balance, Shares at Dec. 31, 2019	31,968,570							31,968,570
Beginning Balance at Dec. 31, 2019	$ (39,144)	$ 7		2,061	(41,212)
Beginning Balance, Shares at Dec. 31, 2019		6,720,767
Options exercised for common stock	22			22
Options exercised for common stock, Shares		58,498
Share based compensation expense	495			495
Net income (loss)	4,112				4,112
Ending Balance at Mar. 31, 2020								$ 54,170
Ending Balance, Shares at Mar. 31, 2020								31,968,570
Ending Balance at Mar. 31, 2020	(34,515)	$ 7		2,578	(37,100)
Ending Balance, Shares at Mar. 31, 2020		6,779,265
Beginning Balance at Dec. 31, 2019	$ 54,170							$ 54,170
Beginning Balance, Shares at Dec. 31, 2019	31,968,570							31,968,570
Beginning Balance at Dec. 31, 2019	$ (39,144)	$ 7		2,061	(41,212)
Beginning Balance, Shares at Dec. 31, 2019		6,720,767
Net income (loss)	$ 6,804
Ending Balance, Shares at Sep. 30, 2020	0
Ending Balance at Sep. 30, 2020	$ 191,484	$ 49		225,843	(34,408)
Ending Balance, Shares at Sep. 30, 2020		48,658,271
Beginning Balance at Mar. 31, 2020								$ 54,170
Beginning Balance, Shares at Mar. 31, 2020								31,968,570
Beginning Balance at Mar. 31, 2020	(34,515)	$ 7		2,578	(37,100)
Beginning Balance, Shares at Mar. 31, 2020		6,779,265
Conversion of preferred stock to common stock upon initial public offering								$ (54,170)
Conversion of preferred stock to common stock upon initial public offering, Shares								(31,968,570)
Conversion of preferred stock to common stock upon initial public offering	54,170	$ 32		54,138
Conversion of preferred stock to common stock upon initial public offering, Shares		31,968,570
Issuance of common stock in connection with initial public offering, net of issuance costs of $16.3 million	162,979	$ 9		162,970
Issuance of common stock in connection with initial public offering, net of issuance costs of $16.3 million, Shares		9,432,949
Conversion and reclassification of preferred stock warrants to common stock warrants upon initial public offering	4,486			4,486
Exercise of common stock warrants	4			4
Exercise of common stock warrants, Shares		102,533
Options exercised for common stock	45			45
Options exercised for common stock, Shares		76,764
Share based compensation expense	505			505
Net income (loss)	$ (3,804)				(3,804)
Ending Balance, Shares at Jun. 30, 2020	0
Ending Balance at Jun. 30, 2020	$ 183,870	$ 48		224,726	(40,904)
Ending Balance, Shares at Jun. 30, 2020		48,360,081
Options exercised for common stock	161	$ 1		160
Options exercised for common stock, Shares		298,139
Issuance of common stock upon vesting of restricted stock units,net of shares withheld for taxes	(2)			(2)
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes, Shares		51
Share based compensation expense	959			959
Net income (loss)	$ 6,496				6,496
Ending Balance, Shares at Sep. 30, 2020	0
Ending Balance at Sep. 30, 2020	$ 191,484	$ 49		$ 225,843	$ (34,408)
Ending Balance, Shares at Sep. 30, 2020		48,658,271