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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Stock-based compensation expense $ 41 $ (20)   $ 61 $ 523
Unearned stock-based compensation 200 100 $ 200    
Unearned compensation expected to be recognized, period     2 years 10 months 24 days    
Cost of sales          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Stock-based compensation expense 0 0   1 7
Product development          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Stock-based compensation expense 1 (6)   2 22
Selling, general, and administrative          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Stock-based compensation expense $ 40 $ (14)   $ 58 $ 494