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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Stock-based compensation expense | $ 44 | $ 140
Unearned stock-based compensation | $ 300 | 600
Unearned compensation expected to be recognized, period | 2 years 7 months 6 days |
Cost of sales |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Stock-based compensation expense | $ 1 | 2
Product development |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Stock-based compensation expense | 6 | 6
Selling, general, and administrative |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Stock-based compensation expense | $ 37 | $ 132

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