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Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total stock-based compensation expense $ 1,290 $ 937
Stock Option Plan [Member] | Cost of Revenues [Member]    
Total stock-based compensation expense 22 5
Stock Option Plan [Member] | Research and Development [Member]    
Total stock-based compensation expense 257 194
Stock Option Plan [Member] | General and Administrative [Member]    
Total stock-based compensation expense 778 634
Stock Option Plan [Member] | Sales and Marketing [Member]    
Total stock-based compensation expense $ 233 $ 104