Leases - Schedule of Lease Expense, Cash Flow, Operating and Finance Lease Assets and Liabilities, Average Lease Term and Average Discount Rate (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019
Finance lease expense:
Amortization of right-of-use assets	$ 321	$ 354
Interest on lease liabilities	22	22
Operating lease expense	857	845
Total lease expense	1,200	1,221
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from finance leases	22	22
Operating cash outflows from operating leases	932	891
Financing cash outflows from finance leases	288	292
Right-of-use assets obtained in exchange for finance lease liabilities, net of terminations and disposals	756	148
Right-of-use assets obtained in exchange for operating lease liabilities, net of terminations and disposals	152	$ 65
Operating leases:
Other non-current assets	12,705		$ 13,598
Accrued liabilities	$ (2,672)		(2,868)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses	Accrued expenses
Other non-current liabilities	$ (10,718)		(11,513)
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other non-current liabilities	Other non-current liabilities
Total operating lease liabilities	$ (13,390)		(14,381)
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesAndStockholdersEquity	us-gaap:LiabilitiesAndStockholdersEquity
Property, plant and equipment gross	$ 6,506	$ 5,735
Accumulated depreciation	(3,640)		(3,319)
Property, plant and equipment, net	2,866	2,416
Current portion of long-term debt	(1,240)		(1,113)
Long-term debt (less current portion)	(2,254)	$ (2,275)
Total finance lease liabilities	$ (3,494)		$ (3,388)
Weighted-average remaining lease term - finance leases (years)	3 years 10 months 24 days		3 years 10 months 24 days
Weighted-average remaining lease term - operating leases (years)	5 years 10 months 24 days		6 years 1 month 6 days
Weighted-average discount rate - finance leases	2.90%		3.00%
Weighted-average discount rate - operating leases	3.70%		3.80%