Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 114,188	$ 59,004	$ 207,910	$ 143,404
Remaining performance obligation	34,200		34,200
Change In Contract With Customer Liability [Roll Forward]
Balance, beginning of period	2,050	479	1,225	816
Cash additions	2,371	351	4,470	512
Revenue recognition	(918)	(268)	(2,192)	(766)
Balance, end of period	3,503	562	3,503	562
United States
Disaggregation of Revenue [Line Items]
Net sales	97,363	48,897	177,313	119,085
Canada
Disaggregation of Revenue [Line Items]
Net sales	6,248	3,557	12,497	11,486
All other
Disaggregation of Revenue [Line Items]
Net sales	10,577	6,550	18,100	12,833
Product sales
Disaggregation of Revenue [Line Items]
Net sales	110,595	56,326	200,477	136,458
Extended warranties and services
Disaggregation of Revenue [Line Items]
Net sales	1,465	1,168	3,400	3,637
Other
Disaggregation of Revenue [Line Items]
Net sales	2,128	$ 1,510	4,033	$ 3,309
Retail Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	13,600		13,600		$ 5,800
Direct Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 20,600		$ 20,600		$ 8,000