Summary of Significant Accounting Policies - Net Revenue Disaggregated by Product Categories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		39 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 40,603	$ 24,672	$ 88,817	$ 53,576	$ 6,200
Product Revenue
Disaggregation Of Revenue [Line Items]
Total net revenue	40,285	24,556	87,569	53,392
Product Revenue | Cookware, Kitchen Tools and Gadgets
Disaggregation Of Revenue [Line Items]
Total net revenue	1,320	2,954	5,279	9,463
Product Revenue | Environmental Appliances (i.e., Dehumidifiers and Air Conditioners)
Disaggregation Of Revenue [Line Items]
Total net revenue	27,083	16,329	52,757	27,601
Product Revenue | Hair Appliances and Accessories
Disaggregation Of Revenue [Line Items]
Total net revenue	732	935	2,590	2,991
Product Revenue | Small Home Appliances
Disaggregation Of Revenue [Line Items]
Total net revenue	8,100	3,669	17,426	10,776
Product Revenue | Portable Projectors, Speakers and Headphones
Disaggregation Of Revenue [Line Items]
Total net revenue	30	62	160	567
Product Revenue | Cosmetics, Skincare, and Heath Supplements
Disaggregation Of Revenue [Line Items]
Total net revenue	2,569	80	8,346	84
Product Revenue | All Others
Disaggregation Of Revenue [Line Items]
Total net revenue	451	527	1,011	1,910
Managed SaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 318	$ 116	$ 1,248	$ 184