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Fair Value Measures and Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Financial Instrument Measured on a Recurring Basis | The following table sets forth the Company's financial instruments that were measured at fair value on a recurring basis within the fair value hierarchy (in thousands):
|  | December 31, 2019 |  |  |  |  |  |
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |
Money market funds |  | $ | 70,760 |  |  | $ | 70,760 |  |  | $ | — |  |  | $ | — |
|  | December 31, 2018 |  |  |  |  |  |
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |
Money market funds |  | $ | 8,618 |  |  | $ | 8,618 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |
Redeemable convertible preferred stock warrant liabilities |  | $ | 1,503 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,503 |
Schedule of Fair Value, Financial Instruments Measured on Recurring Basis, Level 3 Hierarchy | The following table includes a roll-forward of the financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy (in thousands):
|  |  |  | Liability Classified Warrants |
Balances at December 31, 2017 |  |  |  | $ | 896 |  |
Issuance of warrants to purchase shares of Series F redeemable convertible preferred stock in connection with 2017 Term Loan (Note 4) |  |  |  | 289 |  |
Remeasurement of financial instruments |  |  |  | 318 |  |
Balances at December 31, 2018 |  |  |  | 1,503 |  |
Remeasurement of financial instruments |  |  |  | (267) |  |
Net exercise of preferred stock warrants |  |  |  | (510) |  |
Reclassification of liability classified warrants to stockholders' equity (deficit) |  |  |  | (726) |  |
Balance at December 31, 2019 |  |  |  | $ | — |  |

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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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- 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=117815213&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=117815213&loc=d3e19207-110258 + Details
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