Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Schedule of Components of Stock Compensation Expense

The components of stock-based compensation expense were as follows:

	Three months ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
	(in thousands)				(in thousands)
2007 Stock Incentive Plan	$	—	$	957	$	—	$	1,642
2021 Stock Incentive Plan	3,027		3,507		7,634		5,506
Employee Stock Purchase Plan	14		72		36		150
Total Stock Compensation Expense	$	3,041	$	4,536	$	7,670	$	7,298

Summary of Restricted Stock Activity

The following table summarizes the restricted stock activity during the six months ended June 30, 2022:

	Shares
Balance of unvested shares as of December 31, 2021	560,608
Shares granted	330,400
Shares forfeited	—
Shares vested	(368,810)
Balance of unvested shares as of June 30, 2022	522,198