Revenues (Details) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 206,075,000	$ 206,075,000	$ 93,722,000	$ 589,534,000	$ 552,560,000	$ 309,285,000
Remaining performance obligation	32,900,000			32,900,000
Change In Contract With Customer Liability [Roll Forward]
Balance, beginning of period		6,392,000	$ 1,225,000	5,551,000	1,225,000	816,000
Cash additions		4,739,000		4,537,000	9,148,000	2,330,000
Deferred revenue		0		6,875,000	0	0
Revenue recognition		(5,580,000)		(10,678,000)	(3,981,000)	(1,921,000)
Balance, end of period	6,285,000	5,551,000		6,285,000	6,392,000	1,225,000
Cash Equivalents	0	9,700,000		0
Fair Value, Measurements, Recurring
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		9,679,000			14,902,000
Available-for-Sale Securities					36,199,000
Assets, Fair Value Disclosure		83,127,000			51,329,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	128,000	672,000		128,000	15,000
Fair Value, Measurements, Recurring | Money market funds
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		9,679,000			14,902,000
Fair Value, Measurements, Recurring | Certificates of deposit
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities					5,993,000
Fair Value, Measurements, Recurring | Corporate bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		8,227,000			2,067,000
Fair Value, Measurements, Recurring | U.S. government bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		55,227,000			28,139,000
Level 1 | Fair Value, Measurements, Recurring
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		9,679,000			14,902,000
Available-for-Sale Securities					0
Assets, Fair Value Disclosure		9,679,000			14,902,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0		0	0
Level 1 | Fair Value, Measurements, Recurring | Money market funds
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		9,679,000			14,902,000
Level 1 | Fair Value, Measurements, Recurring | Certificates of deposit
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		0			0
Level 1 | Fair Value, Measurements, Recurring | Corporate bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		0			0
Level 1 | Fair Value, Measurements, Recurring | U.S. government bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		0			0
Level 2 | Fair Value, Measurements, Recurring
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		0			0
Available-for-Sale Securities					36,199,000
Assets, Fair Value Disclosure		73,448,000			36,427,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	128,000	672,000		128,000	15,000
Level 2 | Fair Value, Measurements, Recurring | Money market funds
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		0			0
Level 2 | Fair Value, Measurements, Recurring | Certificates of deposit
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities					5,993,000
Level 2 | Fair Value, Measurements, Recurring | Corporate bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		8,227,000			2,067,000
Level 2 | Fair Value, Measurements, Recurring | U.S. government bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		55,227,000			28,139,000
Level 3 | Fair Value, Measurements, Recurring
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		0			0
Available-for-Sale Securities					0
Assets, Fair Value Disclosure		0			0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0		0	0
Level 3 | Fair Value, Measurements, Recurring | Money market funds
Change In Contract With Customer Liability [Roll Forward]
Cash Equivalents		0			0
Level 3 | Fair Value, Measurements, Recurring | Certificates of deposit
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		0			0
Level 3 | Fair Value, Measurements, Recurring | Corporate bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		0			0
Level 3 | Fair Value, Measurements, Recurring | U.S. government bonds
Change In Contract With Customer Liability [Roll Forward]
Available-for-Sale Securities		0			0
United States
Disaggregation of Revenue [Line Items]
Net sales		156,607,000		460,237,000	461,521,000	256,182,000
Canada
Disaggregation of Revenue [Line Items]
Net sales		26,987,000		74,883,000	43,196,000	24,768,000
Europe, The Middle East And Africa
Disaggregation of Revenue [Line Items]
Net sales		18,477,000		41,026,000	36,166,000	17,303,000
All other
Disaggregation of Revenue [Line Items]
Net sales		4,004,000		13,388,000	11,677,000	11,032,000
Product sales
Disaggregation of Revenue [Line Items]
Net sales		199,755,000		567,914,000	534,758,000	296,447,000
Extended warranties and services
Disaggregation of Revenue [Line Items]
Net sales		2,860,000		7,053,000	8,157,000	6,691,000
Other
Disaggregation of Revenue [Line Items]
Net sales		$ 3,460,000		14,567,000	$ 9,645,000	$ 6,147,000
Retail Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	800,000			800,000
Direct Orders
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 32,100,000			$ 32,100,000