Mezzanine Equity and Stockholders' Deficiency (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Equity [Abstract]

Summary of Rollforward of Balance of Redeemable Noncontrolling Interest

The rollforward of the balance of the redeemable noncontrolling interest is as follows:

	Redeemable noncontrolling interest
	(in thousands)
Beginning balance (December 31, 2020)	$	3,061
Issuance of redeemable noncontrolling interest in EduTech		238
Net income (loss) attributable to redeemable noncontrolling interest		(178	)
Other comprehensive income (loss) attributable to redeemable noncontrolling interest		0
Adjustment to present redemption value as of March 31, 2021		575
Ending balance (March 31, 2021)	$	3,696

The rollforward of the balance of the redeemable noncontrolling interest is as follows:

	Redeemable noncontrolling interest
	(in thousands)
Beginning balance (December 24, 2020)	$	3,034
Adjustment to present redemption value as of December 31, 2020		27
Ending balance (December 31, 2020)	$	3,061

Summary of Redeemable Convertible Preferred Stock

The following table summarizes the redeemable convertible preferred stock with balances outstanding at December 31, 2020 or December 31, 2019:

	December 31, 2020						December 31, 2019
	(in thousands, except share amounts)
Preferred shares issued and outstanding:	Shares issued and outstanding		Liquidation preference		Recorded amount		Shares issued and outstanding		Liquidation preference		Recorded amount
Series B-1 Preferred Stock		—		—		—		694,498		22,841		21,456
Series B-2 Preferred Stock		—		—		—		351,445		11,559		10,858
Series C Preferred Stock		4,832,409		403,361		183,390		4,832,409		247,500		150,342
		4,832,409	$	403,361	$	183,390		5,878,352	$	281,900	$	182,656