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Summary of Significant Accounting Policies - Net Revenue Disaggregated by Product Categories (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 39 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | $ 30,368 | $ 14,588 | $ 48,213 | $ 28,904 | $ 6,200
Product Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 29,971 | 14,550 | 47,283 | 28,836 |
Product Revenue | Cookware, Kitchen Tools and Gadgets |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 1,920 | 2,787 | 3,959 | 6,509 |
Product Revenue | Environmental Appliances (i.e., Dehumidifiers and Air Conditioners) |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 19,111 | 6,077 | 25,674 | 11,272 |
Product Revenue | Hair Appliances and Accessories |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 784 | 927 | 1,858 | 2,056 |
Product Revenue | Small Home Appliances |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 5,096 | 3,882 | 9,326 | 7,107 |
Product Revenue | Portable Projectors, Speakers and Headphones |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 54 | 189 | 130 | 505 |
Product Revenue | Cosmetics, Skincare, and Heath Supplements |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 2,610 | 2 | 5,777 | 4 |
Product Revenue | All Others |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | 396 | 686 | 559 | 1,383 |
Managed SaaS |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net revenue | $ 397 | $ 38 | $ 930 | $ 68 |

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