Components of Accounts Receivable, Net of Allowance (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Components of accounts receivable, net of allowances
Total receivables, net	$ 4,238	$ 3,059

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant