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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock-based compensation expense
Total stock based compensation expense	$ 1,152	$ 268
Options vested, fair value	1	24
Research and Development Expense
Stock-based compensation expense
Total stock based compensation expense	335	40
Selling, general and administrative expense
Stock-based compensation expense
Total stock based compensation expense	817	$ 228
Options to purchase Common Stock
Stock-based compensation expense
Unrecognized compensation cost	$ 13,300
Weighted-average remaining vesting period for recognition	3 years 2 months 12 days
Options outstanding, weighted average contractual life	8 years 3 months 18 days

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

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