Summary of Significant Accounting Policies - Net Revenue Disaggregated by Product Categories (Details) - USD ($) $ in Thousands	12 Months Ended		39 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 114,451	$ 73,279	$ 6,200
Product Revenue
Disaggregation Of Revenue [Line Items]
Total net revenue	112,766	72,783
Product Revenue | Environmental Appliances (i.e., Dehumidifiers and Air Conditioners)
Disaggregation Of Revenue [Line Items]
Total net revenue	64,521	34,017
Product Revenue | Small Home Appliances
Disaggregation Of Revenue [Line Items]
Total net revenue	24,621	14,800
Product Revenue | Cosmetics, Skincare, and Health Supplements
Disaggregation Of Revenue [Line Items]
Total net revenue	11,195	2,464
Product Revenue | Cookware, Kitchen Tools and Gadgets
Disaggregation Of Revenue [Line Items]
Total net revenue	6,872	11,463
Product Revenue | Hair Appliances and Accessories
Disaggregation Of Revenue [Line Items]
Total net revenue	3,341	6,510
Product Revenue | All Others
Disaggregation Of Revenue [Line Items]
Total net revenue	2,216	3,529
Managed SaaS
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 1,685	$ 496