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Stockholders' Equity - Stock-based Compensation Expense (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 expense
Total stock based compensation expense	$ 1,055	$ 1,036	$ 2,207	$ 1,304
Options vested, fair value			3,000	1,200
Research and Development Expense
Stock-based compensation expense
Total stock based compensation expense	126	72	460	112
Selling, general and administrative expense
Stock-based compensation expense
Total stock based compensation expense	929	$ 964	1,747	$ 1,192
Options to purchase Common Stock
Stock-based compensation expense
Unrecognized compensation cost	$ 10,800		$ 10,800
Weighted-average remaining vesting period for recognition			3 years
Options outstanding, weighted average contractual life			7 years 10 months 24 days

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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