Income Taxes - Schedule of Significant Components of the Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 30,967	$ 19,167
Research and development credits	5,168	4,982
Other state credits	3,090	3,372
Inventory	2,511	2,693
Allowances and bad debts	1,146	1,356
Accrued warranty	9,492	8,441
Accrued wages and benefits	107	240
Other accrued expenses	4,533	1,789
Stock-based compensation	182	223
Capitalized research and development costs	160	210
163(j) disallowed interest	1,634	2,305
Intangible amortization	668	1,357
Contract liabilities	1,005	3,307
Operating lease liability	3,862	4,934
Other	752	612
Total deferred tax assets	65,277	54,988
Valuation allowance	(60,177)	(48,056)
Total deferred tax assets, net of valuation allowance	5,100	6,932
Deferred tax liabilities:
ROU operating lease asset	(3,537)	(4,545)
Tax depreciation in excess of book depreciation on property, plant and equipment	(2,579)	(3,273)
Total deferred tax liabilities	(6,116)	(7,818)
Net deferred tax liability	$ (1,016)	$ (886)