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+ References

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Amount of cost to be recognized for option under share-based payment arrangement.

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Stock-Based Compensation - Expense and ESPP (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock-Based Compensation
Unrecognized compensation expense	$ 21,436		$ 21,436
Remaining unamortized expense period			1 year 8 months 12 days
Stock options
Stock-Based Compensation
Share-based compensation costs recognized	4,482	$ 6,769	$ 8,307	$ 12,334
Stock options \| Research and development expense
Stock-Based Compensation
Share-based compensation costs recognized	1,269	2,173	2,271	4,205
Stock options \| Selling, general and administrative
Stock-Based Compensation
Share-based compensation costs recognized	$ 3,213	$ 4,596	$ 6,036	$ 8,129