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Revenue Recognition (Details 1)	9 Months Ended
	Sep. 30, 2021 USD ($)
Revenue Recognition
Deferred revenue, beginning	$ 180,000
Reclassification of beginning deferred revenue to revenue, as a result of performance obligations satisfied	(148,000)
Cash received in advance and not recognized as revenue	179,000
Deferred revenue, ending	$ 211,000

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- References

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- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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