The following table provides balances of customer receivables and contract liabilities (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Customer Deposits Contract Receivables And Contract Liabilities
Customer receivables (1)
Contract liabilities (Customer deposits) (1), (2) (a), (b), (c)	$ 178,000	$ 209,000

Carrying amount as of the balance sheet date of amounts received from and refundable to customers unless used by them to obtain goods and services from the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CustomerFunds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant