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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based compensation expense $ 744 $ 3,783 $ 393
Employee Stock Option Plans      
Share-based compensation expense 743 3,761 363
Non-Employee Stock Option Agreements      
Share-based compensation expense 1 22 30
Research & Development Expenses      
Share-based compensation expense 177 485 6
Selling & Marketing Expenses      
Share-based compensation expense 280 820 209
General & Administrative Expenses      
Share-based compensation expense $ 287 $ 2,478 $ 178