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