Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Activity Under Stock Option Plan

Stock option activity under the Company's stock options plans for the years ending December 31, 2021 and 2020 were as follows:

(in thousands, except share and per share data)	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding, December 31, 2019		5,842,879		3.21
Granted		2,222,368		3.39
Exercised		(338,333	)	2.01
Cancelled		(886,195	)	4.22
Outstanding, December 31, 2020		6,840,719		3.81
Granted		9,380,438		2.62
Exercised		(363,109	)	2.86
Cancelled		(5,192,179	)	3.65
Outstanding, December 31, 2021		10,665,869		$	2.87		8.67	$	—
Options exercisable, December 31, 2021		4,410,312		$	3.85		7.53	$	—
Options exercisable, December 31, 2020		3,596,315		$	4.17		6.90	$	598
Options available for future grant at December 31, 2021		30,564

Summary of Non-Vested Restricted Stock

A summary of the status of restricted stock as of December 31, 2021 and 2020 is as follows:

	Number of Shares			Weighted-Average Grant Date Fair Value
Non-vested, December 31, 2019		939,636			2.93
Granted		805,900			3.75
Vested		(764,359	)		3.51
Cancelled		(194,897	)		3.44
Non-vested, December 31, 2020		786,280			3.08
Granted		1,601,224			2.60
Vested		(754,137	)		3.40
Cancelled		(434,787	)		3.45
Non-vested, December 31, 2021		1,198,580		$	2.10