Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Schedule of Stock-based Compensation Expense

The following table sets forth the Company’s stock-based compensation expense for the periods indicated (in thousands):

	Three Months Ended March 31,
	2023		2022
Equity Classified Awards
Cost of production	$	18	$	193
General and administrative	3,923		3,494
Other	736		357
Total equity classified awards	4,677		4,044
Liability Classified Awards
General and administrative	—		214
Total liability classified awards	—		214
Total stock-based compensation	$	4,677	$	4,258

Schedule Stock Option Award Activity

Stock option activity under the Company’s stock incentive plans and changes during the three months ended March 31, 2023, were as follows:

	Number of Options	Weighted-Average Exercise Price (1)		Weighted-Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Options outstanding at December 31, 2022	5,945,321	$	4.65	9.6	$	—
Granted	55,918	$	2.12		$	—
Canceled or forfeited	(26,173)	$	8.04		$	—
Exercised	—	$	—		$	—
Options outstanding at March 31, 2023	5,975,066	$	4.62	9.1	$	—
Options vested and expected to vest at March 31, 2023	1,492,796	$	5.26	0.5	$	—

(1)Exercise price of options outstanding range from $2.12 to $11,160 as of March 31, 2023. The higher end of the range is due to the impact of several reverse stock splits during the years 2015 to 2018, subsequent to certain option grants, and relates to awards that expire during 2023.

Schedule of Non-vested Restricted Stock Awards

Non-vested restricted stock awards and the changes during the three months ended March 31, 2023, were as follows:

	Number of Shares	Weighted-Average Grant-Date Fair Value
Outstanding at December 31, 2022	5,254,457	$	3.94
Granted	89,334	$	1.89
Vested and issued	—	$	—
Canceled or forfeited	(7,295)	$	3.39
Non-vested at March 31, 2023	5,336,496	$	3.91