Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Options Activity

The following is a summary of stock options activity during the year-ended December 31, 2021:

	Options Outstanding
	Number of Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (years)		Aggregate Intrinsic Value
Balance—January 1, 2021		1,570,728		$	9.09		7.71	$	12,756
Options granted		—		$	—	—		$	—
Options exercised		(1,011,422	)	$	9.00		—	$	—
Options cancelled		(36,401	)	$	9.17	—		$	—
Balance—December 31, 2021		522,905		$	9.25		6.77	$	25,971
Exercisable as of December 31, 2021		520,256		$	9.25		6.77	$	25,971
Vested and expected to vest as of December 31, 2021		522,905		$	9.25		6.77	$	25,971

Summary of Restricted Stock Activity

A summary of restricted stock activity within the Company’s equity plans and changes for the year-ended December 31, 2021, is as follows:

Restricted Stock Awards	Shares			Weighted Average Grant- Date Fair Value
Nonvested at January 1, 2021		3,259,389		$	13.51
Granted		2,028,547		$	15.56
Vested		(2,798,872	)	$	13.56
Forfeited		(382,884	)	$	14.59
Nonvested at December 31, 2021		2,106,180		$	14.94

Summary of Total Stock-based Compensation Expense by Function

Stock-based compensation expense is allocated based on the cost center to which the award holder belongs. The following table summarizes the total stock-based compensation expense by function, including expense related to consultants for years-ended December 31, 2020 and 2021.

			Years-End December 31,
	2019		2020		2021
			(in thousands)
Sales and distribution expenses	$	7,358	$	2,533	$	6,809
Research and development expenses		5,711		3,965		5,339
General and administrative expenses		21,612		16,218		16,839
Total stock-based compensation expense	$	34,681	$	22,716	$	28,987