Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Summary Of Activity For The Company's Restricted Shares

	Shares	Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2021	13,817	$	7.99
Granted	15,340	4.21
Vested	(4,429)	10.36
Forfeited	(7,476)	7.25
Unvested at December 31, 2022	17,252	$	4.87

The activity for performance-based restricted stock units in the year ended December 31, 2022 was as follows (in thousands, except weighted-average grant-date fair value amounts):

	Shares	Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2021	11,038	$	5.08
Granted	4,728	3.06
Vested	(854)	6.42
Forfeited	(752)	3.26
Unvested at December 31, 2022	14,160	$	4.80

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table summarizes the Company’s total stock-based compensation expense by line item for the years ended December 31, 2022 and 2021 (in thousands):

	Year Ended December 31,
	2022	2021
Research and development	31,083	25,768
Selling, general and administrative	48,490	82,592
Total	79,573	108,360

The fair value of the Warrants at the issuance date was measured using the Black-Scholes-Merton option pricing model. The key inputs used in the valuation were as follows:

Expected term (years)	10
Risk free interest rate	3.0		%
Expected volatility	91.3		%
Dividend yield	—		%
Exercise price	$	2.15
Stock price	$	3.63

The fair value of the warrants at the issuance date was measured using the Black-Scholes-Merton option pricing model. The key inputs used in the valuation were as follows:

Expected term (years)	1
Risk free interest rate	4.7		%
Expected volatility	116.5		%
Dividend yield	—		%
Exercise price	$	1.15
Stock price	$	1.23