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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Financial Assets Measured at Fair Value on Recurring Basis | The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2019 (in thousands):
| Carrying Amount as of December 31, 2018 |  | Fair Value Measurements As of December 31, 2018
|  | Level 1 |  | Level 2 |  | Level 3
3.25% convertible senior notes due in 2020 | $ | 27,974 |  |  | $ | — |  |  | $ | — |  |  | $ | 27,974 |
| 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 2020 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
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 table provides 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 2020 | Year ended December 31,
| 2018 |  | 2019
Balance at January 1, | $ | 22,469 |  |  | $ | 27,974 |
Issuance of 3.25% convertible senior notes | 8,000 |  |  | — |
Additions | — |  |  | 7,250 |
Loss on extinguishment of convertible senior notes | 453 |  |  | 10,417 |
Extinguishment of convertible senior notes | — |  |  | (48,170 | )
Change in fair value | (2,948 | ) |  | 2,529 |
Balance at December 31, | $ | 27,974 |  |  | $ | — |
3.25% convertible senior notes due 2023 | Year ended December 31,
| 2018 |  | 2019
Balance at January 1, | $ | — |  |  | $ | — |
New issuance ($29.6 million face value) | — |  |  | 37,916 |
New issuance ($8.0 million face value) | — |  |  | 10,254 |
Change in fair value | — |  |  | 2,583 |
Balance at December 31, | $ | — |  |  | $ | 50,753 |
Preferred stock derivative liability | Year ended December 31,
| 2018 |  | 2019
Balance at January 1, | $ | — |  |  | $ | — |
New issuance of Series A Preferred Stock ($20.0 million face value) | — |  |  | 4,894 |
Change in fair value | — |  |  | 353 |
Balance at December 31, | $ | — |  |  | $ | 5,247 |

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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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