Lease contracts - Summary of Operating Leases Future Minimum Payments Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current portion	$ 2,154	$ 3,438
Year 2	1,862	3,147
Year 3	295	2,317
Year 4		773
Year 5		790
Thereafter		1,220
Total minimum lease payments	4,311	11,684
Less: Effects of discounting	(370)	(1,534)
Present value of operating lease	3,941	10,150
Less: current portion	(1,968)	(3,003)
Long-term operating leases	1,973	7,147
Real Estate [Member]
Current portion	2,104	3,361
Year 2	1,843	3,124
Year 3	284	2,299
Year 4		771
Year 5		790
Thereafter		1,220
Total minimum lease payments	4,231	11,565
Less: Effects of discounting	(363)	(1,526)
Present value of operating lease	3,868	10,039
Less: current portion	(1,922)	(2,929)
Long-term operating leases	$ 1,946	$ 7,110
Weighted average remaining lease term (years)	1 year 9 months 14 days	4 years 1 month 20 days
Weighted average discount rate	3.14%	4.84%
Other Asset [Member]
Current portion	$ 50	$ 77
Year 2	19	23
Year 3	11	18
Year 4		1
Total minimum lease payments	80	119
Less: Effects of discounting	(6)	(8)
Present value of operating lease	73	111
Less: current portion	(46)	(74)
Long-term operating leases	$ 27	$ 37
Weighted average remaining lease term (years)		2 years 3 days
Weighted average discount rate	1.29%	3.32%

Operating lease liabilities noncurrent.

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- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980

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- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981

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- Definition

Amount of lease payment to be received by lessor for operating lease in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lease payment to be received by lessor for operating lease in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lease payment to be received by lessor for operating lease in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lease payment to be received by lessor for operating lease after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lease payment to be received by lessor for operating lease in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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