Condensed Consolidated Statements of Mezzanine Equity and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Redeemable Convertible Preferred Stock
Beginning Balance at Dec. 31, 2019						$ 54,170
Beginning Balance, Shares at Dec. 31, 2019						31,968,570
Beginning Balance at Dec. 31, 2019	$ (39,144)	$ 7	$ 2,061	$ 0	$ (41,212)
Beginning Balance, Shares at Dec. 31, 2019		6,720,767
Options exercised for common stock	22	$ 0	22	0	0	$ 0
Options exercised for common stock, Shares		58,498				0
Share based compensation	495	$ 0	495	0	0	$ 0
Net (loss) income	4,112	0	0	0	4,112	0
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	0	(37,100)
Ending Balance, Shares at Mar. 31, 2020		6,779,265
Beginning Balance at Dec. 31, 2019						$ 54,170
Beginning Balance, Shares at Dec. 31, 2019						31,968,570
Beginning Balance at Dec. 31, 2019	(39,144)	$ 7	2,061	0	(41,212)
Beginning Balance, Shares at Dec. 31, 2019		6,720,767
Net (loss) income	6,804
Ending Balance at Sep. 30, 2020						$ 0
Ending Balance, Shares at Sep. 30, 2020						0
Ending Balance at Sep. 30, 2020	191,484	$ 49	225,843	0	(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	0	(37,100)
Beginning Balance, Shares at Mar. 31, 2020		6,779,265
Options exercised for common stock	45	$ 0	45	0	0	$ 0
Options exercised for common stock, Shares		76,764				0
Conversion of preferred stock to common stock upon initial public offering	54,170	$ 32	54,138	0	0	$ (54,170)
Conversion of preferred stock to common stock upon initial public offering, Shares		31,968,570				(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	0	0	$ 0
Issuance of common stock in connection with initial public offering, net of issuance costs of $16.3 million, Shares		9,432,949				0
Conversion and reclassification of preferred stock warrants to common stock warrants upon initial public offering	4,486	$ 0	4,486	0	0	$ 0
Exercise Of Common Stock Warrants	4	$ 0	4	0	0	$ 0
Exercise of common stock warrants, Shares		102,533				0
Share based compensation	505	$ 0	505	0	0	$ 0
Net (loss) income	(3,804)	0	0	0	(3,804)	0
Ending Balance at Jun. 30, 2020						$ 0
Ending Balance, Shares at Jun. 30, 2020						0
Ending Balance at Jun. 30, 2020	183,870	$ 48	224,726	0	(40,904)
Ending Balance, Shares at Jun. 30, 2020		48,360,081
Options exercised for common stock	161	$ 1	160	0	0	$ 0
Options exercised for common stock, Shares		298,139				0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes	(2)	$ 0	(2)	0	0	$ 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes, Shares		51				0
Share based compensation	959	$ 0	959	0	0	$ 0
Net (loss) income	6,496	0	0	0	6,496	0
Ending Balance at Sep. 30, 2020						$ 0
Ending Balance, Shares at Sep. 30, 2020						0
Ending Balance at Sep. 30, 2020	191,484	$ 49	225,843	0	(34,408)
Ending Balance, Shares at Sep. 30, 2020		48,658,271
Beginning Balance at Dec. 31, 2020						$ 0
Beginning Balance, Shares at Dec. 31, 2020						0
Beginning Balance at Dec. 31, 2020	200,254	$ 49	227,624	4	(27,423)
Beginning Balance, Shares at Dec. 31, 2020		49,251,614
Options exercised for common stock	381	$ 1	380	0	0	$ 0
Options exercised for common stock, Shares		296,019				0
Issuance of common stock under employee stock purchase plan	1,882	$ 0	1,882	0	0	$ 0
Issuance of common stock under employee stock purchase plan, Shares		36,881				0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes	(49)	$ 0	(49)	0	0	$ 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes, Shares		901				0
Share based compensation	3,836	$ 0	3,836	0	0	$ 0
Other comprehensive income (loss)	(162)	0	0	(162)	0	0
Net (loss) income	7,469	0	0	0	7,469	0
Ending Balance at Mar. 31, 2021						$ 0
Ending Balance, Shares at Mar. 31, 2021						0
Ending Balance at Mar. 31, 2021	213,611	$ 50	233,673	(158)	(19,954)
Ending Balance, Shares at Mar. 31, 2021		49,585,415
Beginning Balance at Dec. 31, 2020						$ 0
Beginning Balance, Shares at Dec. 31, 2020						0
Beginning Balance at Dec. 31, 2020	200,254	$ 49	227,624	4	(27,423)
Beginning Balance, Shares at Dec. 31, 2020		49,251,614
Net (loss) income	8,733
Ending Balance at Sep. 30, 2021						$ 0
Ending Balance, Shares at Sep. 30, 2021						0
Ending Balance at Sep. 30, 2021	234,370	$ 50	253,256	(246)	(18,690)
Ending Balance, Shares at Sep. 30, 2021		50,144,590
Beginning Balance at Mar. 31, 2021						$ 0
Beginning Balance, Shares at Mar. 31, 2021						0
Beginning Balance at Mar. 31, 2021	213,611	$ 50	233,673	(158)	(19,954)
Beginning Balance, Shares at Mar. 31, 2021		49,585,415
Options exercised for common stock	193	$ 0	193	0	0	$ 0
Options exercised for common stock, Shares		213,605				0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes	(706)	$ 0	(706)	0	0	$ 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes, Shares		29,809				0
Share based compensation	4,604	$ 0	4,604	0	0	$ 0
Other comprehensive income (loss)	51	0	0	51	0	0
Net (loss) income	4,068	0	0	0	4,068	0
Ending Balance at Jun. 30, 2021						$ 0
Ending Balance, Shares at Jun. 30, 2021						0
Ending Balance at Jun. 30, 2021	221,821	$ 50	237,764	(107)	(15,886)
Ending Balance, Shares at Jun. 30, 2021		49,828,829
Options exercised for common stock	159	$ 0	159	0	0	$ 0
Options exercised for common stock, Shares		150,662				0
Issuance of common stock under employee stock purchase plan	3,676	$ 0	3,676	0	0	$ 0
Issuance of common stock under employee stock purchase plan, Shares		48,168				0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes	(842)	$ 0	(842)	0	0	$ 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for taxes, Shares		116,931				0
Share based compensation	12,499	$ 0	12,499	0	0	$ 0
Other comprehensive income (loss)	(139)	0	0	(139)	0	0
Net (loss) income	(2,804)	0	0	0	(2,804)	0
Ending Balance at Sep. 30, 2021						$ 0
Ending Balance, Shares at Sep. 30, 2021						0
Ending Balance at Sep. 30, 2021	$ 234,370	$ 50	$ 253,256	$ (246)	$ (18,690)
Ending Balance, Shares at Sep. 30, 2021		50,144,590