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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

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