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Common stock reserved for future issuance (Details) - shares	Dec. 31, 2021	Dec. 31, 2020
A 2004 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2004 Equity Incentive Plan	208,681	393,351
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2004 Equity Incentive Plan	1,378,122	1,994,806
Subordinated Convertible Note [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2004 Equity Incentive Plan	958,904	1,047,945
Warrant To Purchase Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2004 Equity Incentive Plan	50,000

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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+ References

No definition available.

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