Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Stock-Based Compensation
Stock-based compensation expense	$ 2,504	$ 525
Remaining unrecognized stock-based compensation expense	$ 3,200
Weighted average period for recognition of stock-based compensation expense	2 years 6 months
Cost of revenue
Stock-Based Compensation
Stock-based compensation expense	$ 97	37
Research and development expenses
Stock-Based Compensation
Stock-based compensation expense	448	129
Selling, general and administrative expenses
Stock-Based Compensation
Stock-based compensation expense	$ 1,959	$ 359

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

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