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Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Stock-based compensation expense $ 8,916 $ 16,523
Cost of Revenues [Member]    
Stock-based compensation expense 371 1,479
Selling, General and Administrative Expenses [Member]    
Stock-based compensation expense 7,862 13,946
Engineering And Development [Member]    
Stock-based compensation expense $ 683 $ 1,098