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Fair Value Measurement of Assets and Liabilities - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Liabilities
Fair value of embedded derivative	$ 900	$ 4,900
Recurring
Assets
Total assets	126	126
Liabilities
Total liabilities	926	4,898
Recurring | Interest make-whole provision
Liabilities
Fair value of embedded derivative	926	4,898
Recurring | Money market funds
Assets
Fair value of cash equivalents	126	126
Recurring | Level 1
Assets
Total assets	126	126
Liabilities
Total liabilities	0	0
Recurring | Level 1 | Interest make-whole provision
Liabilities
Fair value of embedded derivative	0	0
Recurring | Level 1 | Money market funds
Assets
Fair value of cash equivalents	126	126
Recurring | Level 3
Assets
Total assets	0	0
Liabilities
Total liabilities	926	4,898
Recurring | Level 3 | Interest make-whole provision
Liabilities
Fair value of embedded derivative	926	4,898
Recurring | Level 3 | Money market funds
Assets
Fair value of cash equivalents	$ 0	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959

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- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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