Income Taxes - Summary of Deferred Income Taxes Assets And Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Noncurrent deferred tax assets:
Amortization and fixed assets	$ 1,457	$ 1,992
Accounts receivable	129	166
Inventories	2,032	2,226
Pension obligations	2,134	2,375
Warranty obligations	741	827
Accrued benefits	369	382
Foreign exchange contracts	91
Foreign exchange contracts		(367)
Restricted stock	126	106
Operating leases	165
Tax credit carryforwards	3,843	3,537
Net operating loss carryforwards	12,657	16,817
Other temporary differences not currently available for tax purposes	2,902	2,945
Total noncurrent deferred tax assets	26,646	31,006
Valuation allowance	(11,992)	(14,665)
Net noncurrent deferred tax assets	14,654	16,341
Noncurrent deferred tax liabilities:
Amortization and fixed assets	(2,501)	(2,960)
Accounts receivable	72	54
Inventories	115	123
Warranty obligations	1	1
Accrued benefits	(111)	67
Operating leases	27
Net operating loss carryforwards	1,517	2,272
Other temporary differences not currently available for tax purposes	(678)	(351)
Total noncurrent tax liabilities	(1,558)	(794)
Total net deferred tax asset	$ 13,096	$ 15,547