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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables summarize our financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017 (in thousands):
|  | Carrying Amount as of |  |  | Fair Value Measurements As of September 30, 2018 |
|  | September 30, 2018 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
3.25% convertible senior notes due in 2020 |  |  | (33,436 | ) |  |  | — |  |  |  | — |  |  |  | (33,436 | )
|  | Carrying Amount as of |  |  | Fair Value Measurements As of December 31, 2017 |
|  | December 31, 2017 |  |  | Level 1 |  |  | Level 2 |  | Level 3 |
Cash equivalents |  | $ | 13,718 |  |  | $ | 13,718 |  |  | $ | — |  |  | $ | — |
3.25% convertible senior notes due in 2020 |  |  | (22,469 | ) |  |  | — |  |  |  | — |  |  |  | (22,469 | )
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 assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):
|  | 2018 |
Balance at January 1, 2018 |  | $ | (22,469 | )
Issuance of 3.25% Convertible Senior Notes due in 2020 |  |  | (8,453 | )
Change in fair value |  |  | (2,514 | )
Balance at September 30, 2018 |  | $ | (33,436 | )

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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=99377789&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=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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