Condensed Consolidated Statements of Mezzanine Equity and Stockholders' Equity (Deficiency) (Unaudited) - USD ($) $ in Thousands		Total	Temporary Equity [Member] Redeemable Convertible Preferred Stock [Member]	Temporary Equity [Member] Redeemable Common Shares [Member]	Temporary Equity [Member] Share-based Awards [Member]	Noncontrolling Interest [Member]	Temporary Equity, Including Portion Attributable to Noncontrolling Interests [Member]	Common Stock [Member]		Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Balance, temporary equity, shares (in shares) at Dec. 31, 2020	[1]		42,000,592
Balance, temporary equity, including noncontrolling interest at Dec. 31, 2020			$ 183,390	$ 25,074	$ 1,489	$ 3,061	$ 213,014
Balance (in shares) at Dec. 31, 2020	[1]							100,068,469
Balance at Dec. 31, 2020		$ (192,827)						$ 12		$ 105,159	$ 0	$ (299,789)	$ 1,791
Proceeds from exercise of options (in shares)	[1]							126,730
Proceeds from exercise of options		1,125						$ 0		1,125	0	0	0
Stock-based compensation expense		2,275						0		2,275	0	0	0
Net loss		(4,942)
Net income attributable to and accretion of redeemable noncontrolling interest		397	0	0	0	397	397	(0)		(0)	(0)	397	(0)
Net income attributable to and accretion of redeemable noncontrolling interest		(397)	0	0	0	(397)	(397)	0		0	0	(397)	0
Reclassification of share-based awards to mezzanine equity		(102)	0	0	102	0	102	0		(102)	0	0	0
Remeasurement of redemption value of common shares		183	0	(183)	0	0	(183)	0		0	0	183	0
Remeasurement of redemption value of convertible preferred stock		(8,794)	8,794	0	0	0	8,794	0		0	0	(8,794)	0
Issuance of redeemable noncontrolling interest in EduTech		515	0	0	0	238	238	0		515	0	0	0
Foreign currency translation adjustment			$ 0	0	0	0	0
Foreign currency translation adjustment		(243)						$ 0		0	0	0	(243)
Balance, temporary equity, shares (in shares) at Mar. 31, 2021	[1]		42,000,592
Balance, temporary equity, including noncontrolling interest at Mar. 31, 2021			$ 192,184	24,891	1,591	3,696	222,362
Balance (in shares) at Mar. 31, 2021	[1]							100,195,199
Balance at Mar. 31, 2021		(203,207)						$ 12		108,972	$ 0	(313,739)	1,548
Balance, temporary equity, shares (in shares) at Dec. 31, 2021	[1]		0
Balance, temporary equity, including noncontrolling interest at Dec. 31, 2021		5,210	$ 0	0	0	5,210	5,210
Balance (in shares) at Dec. 31, 2021								181,821,767	[1]		143,564
Balance at Dec. 31, 2021		$ 250,355						$ 18		625,056	$ (1,739)	(375,297)	2,317
Proceeds from exercise of options (in shares)		713,810						713,810	[1]		0
Proceeds from exercise of options		$ 1,036						$ 0		1,036	$ 0	0	0
Common stock issued upon vesting of restricted stock units (in shares)								92,430	[1]		0
Stock-based compensation expense		8,274						$ 0		8,274	$ 0	0	0
Reclassification of earn-out RSUs to earn-out shares		(296)						$ 0		(296)	$ 0	0	0
Purchase of common stock (in shares)								(135,000)			135,000
Purchase of common stock		(743)						$ 0		0	$ (743)	0	0
Net loss		(11,053)						0		0	0	(11,053)	0
Net income attributable to and accretion of redeemable noncontrolling interest		617	0	0	0	617	617	(0)		(0)	(0)	617	(0)
Net income attributable to and accretion of redeemable noncontrolling interest		(617)	$ 0	0	0	(617)	(617)	$ 0		0	$ 0	(617)	0
Balance, temporary equity, shares (in shares) at Mar. 31, 2022	[1]		0
Balance, temporary equity, including noncontrolling interest at Mar. 31, 2022		5,818	$ 0	$ 0	$ 0	$ 5,818	$ 5,818
Balance (in shares) at Mar. 31, 2022								182,493,007	[1]		278,564
Balance at Mar. 31, 2022		$ 245,237						$ 18		$ 634,070	$ (2,482)	$ (386,967)	$ 598

[1] As part of the Business Combination (as disclosed in "Note 3 — Business Combination"), all per share information has been retroactively adjusted using an exchange ratio of 8.69144 per share.