Pension and Other Post Retirement Benefit Plans - Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Balance Sheet Classification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance sheet classification:
Pension benefit obligation	$ (8,163)	$ (8,057)
United States
Change in projected benefit obligation:
Balance at beginning of year	3,871	3,832
Interest cost	85	127	$ 114
Paid pension distributions	(342)	(342)
Actuarial losses	233	254
Balance at end of year	3,847	3,871	3,832
Change in plan assets:
Underfunded Status	(3,847)	(3,871)
Balance sheet classification:
Other current liabilities	(342)	(342)
Pension benefit obligation	(3,505)	(3,529)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses	$ 701	$ 476
Discount rate	1.20%	2.40%
German Plan
Change in projected benefit obligation:
Balance at beginning of year	$ 8,353	$ 7,529
Interest cost	88	147	147
Paid pension distributions	(294)	(285)
Actuarial losses	40	1,116
Exchange rate impact	747	(154)
Balance at end of year	8,934	8,353	7,529
Change in plan assets:
Balance at beginning of year	3,825	3,808
Actual return on plan assets	121	126
Contributions	294	284
Paid pension distributions	(294)	(284)
Actuarial losses	(25)	(30)
Exchange rate impact	355	(79)
Balance at end of year	4,276	3,825	$ 3,808
Underfunded Status	(4,658)	(4,528)
Balance sheet classification:
Pension benefit obligation	(4,658)	(4,528)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses	$ 3,644	$ 3,398
Discount rate	1.08%	1.06%