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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease expense:
Amortization of right-of-use assets	$ 1,219	$ 1,691
Interest on lease liabilities	85	83
Operating lease expense	3,388	3,509
Total lease expense	4,692	5,283
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from finance leases	85	83
Operating cash outflows from operating leases	3,621	3,463
Financing cash outflows from finance leases	960	1,230
Right-of-use assets obtained in exchange for finance lease liabilities, net of terminations and disposals	879	2,573
Right-of-use assets obtained in exchange for operating lease liabilities, net of terminations and disposals	657	18,961
Operating leases:
Other non-current assets	13,598	15,201
Accrued liabilities	$ (2,868)	$ (2,949)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Other non-current liabilities	$ (11,513)	$ (13,282)
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total operating lease liabilities	$ (14,381)	$ (16,231)
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesAndStockholdersEquity	us-gaap:LiabilitiesAndStockholdersEquity
Property, plant and equipment gross	$ 5,735	$ 4,821
Accumulated depreciation	(3,319)	(2,118)
Property, plant and equipment, net	2,416	2,703
Current portion of long-term debt	(1,113)	(1,023)
Long-term debt (less current portion)	(2,275)	(2,045)
Total finance lease liabilities	$ (3,388)	$ (3,068)
Weighted-average remaining lease term - finance leases (years)	3 years 10 months 24 days	4 years 1 month 6 days
Weighted-average remaining lease term - operating leases (years)	6 years 1 month 6 days	6 years 4 months 24 days
Weighted-average discount rate - finance leases	3.00%	2.90%
Weighted-average discount rate - operating leases	3.80%	3.90%