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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques we utilized to determine such fair value (in thousands):
December 31, 2021 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market securities (cash equivalents) |  |  | 41,859 |  |  |  | — |  |  |  | — |  |  |  | 41,859 |
Restricted cash (Note 11) |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
Total assets |  | $ | 41,909 |  |  | $ | — |  |  | $ | — |  |  | $ | 41,909 |
December 31, 2020 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market securities (cash equivalents) |  |  | 35,380 |  |  |  | — |  |  |  | — |  |  |  | 35,380 |
Restricted cash (Note 11) |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
Total assets |  | $ | 35,430 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,430 |
Summary of Cash and Cash Equivalents | Cash and cash equivalents (in thousands):
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
December 31, 2021 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market securities |  |  | 41,859 |  |  |  | — |  |  |  | — |  |  |  | 41,859 |
Total cash and cash equivalents |  | $ | 41,859 |  |  | $ | — |  |  | $ | — |  |  | $ | 41,859 |
Money market securities (restricted cash) |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
Total restricted cash |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 50 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
December 31, 2020 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market securities |  |  | 35,380 |  |  |  | — |  |  |  | — |  |  |  | 35,380 |
Total cash and cash equivalents |  | $ | 35,380 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,380 |
Money market securities (restricted cash) |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
Total restricted cash |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 50 |
Schedule of Aggregate Fair Value of Principal Amount of Convertible Debt | The aggregate fair value of the principal amount of the convertible debt is a Level 2 fair value measurement.
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | Principal |  |  | Carrying |  |  | Fair |  |  | Principal |  |  | Carrying |  |  | Fair |
|  | Amount |  |  | Value |  |  | Value |  |  | Amount |  |  | Value |  |  | Value |
December 2021 Convertible Debt |  | $ | 15,000 |  |  | $ | 14,920 |  |  | $ | 15,204 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
As of December 31, 2021, the Convertible Debt balance was comprised of the following:
|  | Year Ended |
|  | December 31, |
|  | 2021 |
Convertible Debt Information |  |  |  |
Principal |  | $ | 15,000 |
Transaction Costs |  | $ | (109 | )
Accrued paid-in-kind interest |  |  | 29 |
|  |  | 14,920 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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