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Fair Value Measurement of Assets and Liabilities - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | May 12, 2020
--- | --- | --- | ---
Liabilities |  |  |
Interest make-whole payment | $ 1,300 |  | $ 4,600
Recurring |  |  |
Assets |  |  |
Total assets | 126 | $ 126 |
Liabilities |  |  |
Total liabilities | 1,317 | 4,898 |
Recurring | Interest make-whole provision |  |  |
Liabilities |  |  |
Interest make-whole payment | 1,317 | 4,898 |
Recurring | Money market funds |  |  |
Assets |  |  |
Money market funds | 126 | 126 |
Recurring | Level 1 |  |  |
Assets |  |  |
Total assets | 126 | 126 |
Liabilities |  |  |
Total liabilities | 0 | 0 |
Recurring | Level 1 | Interest make-whole provision |  |  |
Liabilities |  |  |
Interest make-whole payment | 0 | 0 |
Recurring | Level 1 | Money market funds |  |  |
Assets |  |  |
Money market funds | 126 | 126 |
Recurring | Level 3 |  |  |
Assets |  |  |
Total assets | 0 | 0 |
Liabilities |  |  |
Total liabilities | 1,317 | 4,898 |
Recurring | Level 3 | Interest make-whole provision |  |  |
Liabilities |  |  |
Interest make-whole payment | 1,317 | 4,898 |
Recurring | Level 3 | Money market funds |  |  |
Assets |  |  |
Money market funds | $ 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=117815213&loc=d3e19207-110258 + Details
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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 No definition available. + Details
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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=121590274&loc=SL5624163-113959 + Details
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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. + References No definition available. + Details
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