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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Finance lease expense:
Amortization of right-of-use assets	$ 350	$ 290	$ 671	$ 644
Interest on lease liabilities	23	20	45	42
Operating lease expense	791	835	1,648	1,680
Total lease expense	1,164	1,145	2,364	2,366
Cash paid for amounts included in the measurement of lease liabilities
Operating cash outflows from finance leases	23	20	45	42
Operating cash outflows from operating leases	871	873	1,803	1,764
Financing cash outflows from finance leases	357	255	645	547
Right-of-use assets obtained in exchange for finance lease liabilities, net of terminations and disposals	79	72	835	220
Right-of-use assets obtained in exchange for operating lease liabilities, net of terminations and disposals	56	$ 215	208	$ 280
Operating leases:
Other non-current assets	12,245		12,245		$ 13,598
Accrued liabilities	$ (2,613)		$ (2,613)		$ (2,868)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses		Accrued expenses		Accrued expenses
Other non-current liabilities	$ (10,257)		$ (10,257)		$ (11,513)
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other non-current liabilities		Other non-current liabilities		Other non-current liabilities
Total operating lease liabilities	$ (12,870)		$ (12,870)		$ (14,381)
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesAndStockholdersEquity		us-gaap:LiabilitiesAndStockholdersEquity		us-gaap:LiabilitiesAndStockholdersEquity
Property, plant and equipment gross	$ 6,938		$ 6,938		$ 5,735
Accumulated depreciation	(3,990)		(3,990)		(3,319)
Property, plant and equipment, net	2,948		2,948		2,416
Current portion of long-term debt	(1,188)		(1,188)		(1,113)
Long-term debt (less current portion)	(2,117)		(2,117)		(2,275)
Total finance lease liabilities	$ (3,305)		$ (3,305)		$ (3,388)
Weighted-average remaining lease term - finance leases (years)	3 years 6 months		3 years 6 months		3 years 10 months 24 days
Weighted-average remaining lease term - operating leases (years)	5 years 4 months 24 days		5 years 4 months 24 days		6 years 1 month 6 days
Weighted-average discount rate - finance leases	2.80%		2.80%		3.00%
Weighted-average discount rate - operating leases	3.70%		3.70%		3.80%