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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Financial Instruments Measured at Fair Value on Recurring Basis | The following tables summarize the Company's financial liabilities measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019 (in thousands):
| Carrying Amount as of June 30, 2020 |  | Fair Value Measurements as of June 30, 2020 |  |  |  |
|  |  | Level 1 |  | Level 2 |  | Level 3
3.25% convertible senior notes due in 2023 | $ | 42,257 |  |  | $ | — |  |  | $ | — |  |  | $ | 42,257 |
Preferred stock derivative liability | 3,164 |  |  | — |  |  | — |  |  | 3,164 |
| Carrying Amount as of December 31, 2019 |  | Fair Value Measurements as of December 31, 2019 |  |  |  |
|  |  | Level 1 |  | Level 2 |  | Level 3
3.25% convertible senior notes due in 2023 | $ | 50,753 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,753 |
Preferred stock derivative liability | 5,247 |  |  | — |  |  | — |  |  | 5,247 |
Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) | The following tables provide a reconciliation of the beginning and ending balances of liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):
3.25% convertible senior notes due in 2023 | 2020
Balance, January 1, | $ | 50,753 |
Conversion of convertible senior notes | (9,473) |
Change in fair value | 52 |
Payment-in-kind interest | 925 |
Balance, June 30, | $ | 42,257 |
Preferred stock derivative liability | 2020
Balance, January 1, | $ | 5,247 |
Change in fair value | (2,083) |
Balance, June 30, | $ | 3,164 |

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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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