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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Summary of Fair Value Assets and Liabilities | The following tables sets forth by level, within the fair value hierarchy, the Company’s assets and liabilities at fair value:
|  | December 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds * |  | $ | 9,250 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,250 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade-in Guarantee** |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | December 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds * |  | $ | 11,006 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,006 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade-in Guarantee** |  | $ | — |  |  | $ | — |  |  | $ | 268 |  |  | $ | 268 |
* | Included in cash and cash equivalents on the consolidated balance sheets.
** | Included in deferred revenue on the consolidated balance sheets.
Summary of Changes in Fair Value of Company's Level 3 Financial Liabilities | The table below sets forth a summary of changes in the fair value of the Company’s level 3 liabilities for the years ended December 31, 2019 and 2018:
|  | Warrant |  |  | Trade-In |
|  | Liability |  |  | Guarantee |
Balance at January 1, 2019 |  | $ | — |  |  | $ | 268 |
Recognition of revenue |  |  | — |  |  |  | (268 | )
Balance at December 31, 2019 |  | $ | — |  |  | $ | — |
Balance at January 1, 2018 |  | $ | 3,785 |  |  | $ | 805 |
Recognition of revenue |  |  | — |  |  |  | (537 | )
Change in fair value |  |  | 970 |  |  |  | — |
Exercised and reclassified to equity |  |  | (1,804 | ) |  |  | — |
Conversion of preferred stock to common stock and reclassified to equity |  |  | (2,951 | ) |  |  |  |
Balance at December 31, 2018 |  | $ | — |  |  | $ | 268 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + 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 (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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