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Fair Value Measurement (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Summary of Change in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table shows the change in Level 3 assets and liabilities measured at fair value on a recurring basis for the three months ended March 31, 2018 and the year ended December 31, 2017:
|  | Derivative asset embedded conversion feature (in thousands) |
Balance, January 1, 2017 |  | $ | 80,651 |
Gain on change in fair value |  |  | 28,242 |
Reclassification of derivative asset to equity |  |  | (108,893 | )
Balance, December 31, 2017 and March 31, 2018 |  | $ | — |

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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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