CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Convertible Preferred Stock
Beginning balance (in shares) at Dec. 31, 2019						7,007,429
Beginning balance at Dec. 31, 2019						$ 21,802
Beginning balance (in shares) at Dec. 31, 2019		20,688,439
Beginning balance at Dec. 31, 2019	$ 9,378	$ 2	$ 156,179	$ (144)	$ (146,659)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from issuance of Series A Convertible Preferred Stock, net of issuance costs of $169 (in shares)						717,616
Proceeds from issuance of Series A Convertible Preferred Stock, net of issuance costs of $169						$ 2,342
Collection of receivable for issuance of Series A Convertible Preferred Stock						1,450
Stock-based compensation expense	410		410
Series A Convertible Preferred Stock cumulative dividend	(1,990)		(1,990)			$ 1,990
Net income	2,125				2,125
Foreign currency translation (loss) gain	(246)			(246)
Ending balance (in shares) at Sep. 30, 2020						7,725,045
Ending balance at Sep. 30, 2020						$ 27,584
Ending balance (in shares) at Sep. 30, 2020		20,688,439
Ending balance at Sep. 30, 2020	9,677	$ 2	154,599	(390)	(144,534)
Beginning balance (in shares) at Jun. 30, 2020						7,725,045
Beginning balance at Jun. 30, 2020						$ 26,902
Beginning balance (in shares) at Jun. 30, 2020		20,688,439
Beginning balance at Jun. 30, 2020	7,074	$ 2	155,036	(779)	(147,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	245		245
Series A Convertible Preferred Stock cumulative dividend	(682)		(682)			$ 682
Net income	2,651				2,651
Foreign currency translation (loss) gain	389			389
Ending balance (in shares) at Sep. 30, 2020						7,725,045
Ending balance at Sep. 30, 2020						$ 27,584
Ending balance (in shares) at Sep. 30, 2020		20,688,439
Ending balance at Sep. 30, 2020	$ 9,677	$ 2	154,599	(390)	(144,534)
Beginning balance (in shares) at Dec. 31, 2020	0
Beginning balance at Dec. 31, 2020	$ 0
Beginning balance (in shares) at Dec. 31, 2020	33,499,953	33,499,953
Beginning balance at Dec. 31, 2020	$ 210,918	$ 3	364,248	599	(153,932)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of options (in shares)	125,411	125,411
Common stock issued upon exercise of options	$ 1,057		1,057
Issuance of common stock for vesting of restricted stock units (in shares)		652,983
Shares repurchased for withholding tax on restricted stock units (in shares)		(204,369)
Shares repurchased for withholding tax on restricted stock units	(11,805)		(11,805)
Issuance of common stock under cashless warrant exercise (in shares)		418,309
Issuance of common stock under investor warrant exercise (in shares)		3,367,647
Issuance of common stock under investor warrant exercise	56,779		56,779
Issuance of common stock in connection with follow-on public offering, net of offering costs of $16,303 (in shares)		5,526,861
Issuance of common stock in connection with follow-on public offering, net of offering costs of $16,303	309,782	$ 1	309,781
Issuance of common stock in connection with business combination (in shares)		712,444
Issuance of common stock in connection with business combination	42,560		42,560
Stock-based compensation expense	3,326		3,326
Series A Convertible Preferred Stock cumulative dividend	0
Net income	24,462				24,462
Foreign currency translation (loss) gain	$ (2,037)			(2,037)
Ending balance (in shares) at Sep. 30, 2021	0
Ending balance at Sep. 30, 2021	$ 0
Ending balance (in shares) at Sep. 30, 2021	44,099,239	44,099,239
Ending balance at Sep. 30, 2021	$ 635,042	$ 4	765,946	(1,438)	(129,470)
Beginning balance (in shares) at Jun. 30, 2021						0
Beginning balance at Jun. 30, 2021						$ 0
Beginning balance (in shares) at Jun. 30, 2021		41,296,585
Beginning balance at Jun. 30, 2021	562,161	$ 4	707,690	1,202	(146,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of options (in shares)		23,464
Common stock issued upon exercise of options	198		198
Issuance of common stock for vesting of restricted stock units (in shares)		287,236
Shares repurchased for withholding tax on restricted stock units (in shares)		(57,709)
Shares repurchased for withholding tax on restricted stock units	(2,984)		(2,984)
Issuance of common stock under cashless warrant exercise (in shares)		77,047
Issuance of common stock under investor warrant exercise (in shares)		2,016,117
Issuance of common stock under investor warrant exercise	33,992		33,992
Issuance of common stock in connection with business combination (in shares)		456,499
Issuance of common stock in connection with business combination	25,824		25,824
Stock-based compensation expense	1,226		1,226
Series A Convertible Preferred Stock cumulative dividend	0
Net income	17,265				17,265
Foreign currency translation (loss) gain	$ (2,640)			(2,640)
Ending balance (in shares) at Sep. 30, 2021	0
Ending balance at Sep. 30, 2021	$ 0
Ending balance (in shares) at Sep. 30, 2021	44,099,239	44,099,239
Ending balance at Sep. 30, 2021	$ 635,042	$ 4	$ 765,946	$ (1,438)	$ (129,470)