Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 155,391	$ 61,708	$ 363,301	$ 205,112
Remaining performance obligation	72,800		72,800
Change In Contract With Customer Liability [Roll Forward]
Balance, beginning of period	3,503	562	1,225	816
Cash additions	1,182	611	5,652	1,123
Revenue recognition	(1,046)	(279)	(3,238)	(1,045)
Balance, end of period	3,639	894	3,639	894
United States
Disaggregation of Revenue [Line Items]
Net sales	130,289	50,447	307,602	169,532
Canada
Disaggregation of Revenue [Line Items]
Net sales	12,744	5,649	25,241	17,135
All other
Disaggregation of Revenue [Line Items]
Net sales	12,358	5,612	30,458	18,445
Product sales
Disaggregation of Revenue [Line Items]
Net sales	150,639	59,323	351,116	195,781
Extended warranties and services
Disaggregation of Revenue [Line Items]
Net sales	1,905	993	5,305	4,630
Other
Disaggregation of Revenue [Line Items]
Net sales	2,847	$ 1,392	6,880	$ 4,701
Retail Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	49,800		49,800		$ 13,600
Direct Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	23,000		23,000		$ 20,600
Held For Sale Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 5,200		$ 5,200