Stock Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Weighted-Average Assumptions Used to Determine the Fair Value of Options

The following weighted-average assumptions were used to determine the fair value of options and shares purchased under the ESPP:

	Three Months Ended June 30, 2023		Six Months Ended June 30, 2023
	Stock Options	ESPP	Stock Options	ESPP
Expected life	5.0 Years	0.5 Years	5.0 Years	0.5 Years
Expected stock price volatility	0.45	0.66	0.45	0.66
Risk-free interest rate	3.94%	4.77%	3.94%	4.77%

Summary of Total Stock Compensation Expenses

The following table summarizes total stock compensation expenses prior to the capitalization of amounts into Deferred preservation and Inventory costs (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
RSA, RSU, and PSU expense	$	3,396	$	2,470	$	6,038	$	5,238
Stock option and ESPP expense	723		611		1,595		1,183
Total stock compensation expense	$	4,119	$	3,081	$	7,633	$	6,421