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Fair Value (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |
Summary of Change in Level 3 Warrant Liability Value | The following table summarizes the change in our Level 3 warrant liability value (in thousands):
Warrant liability |  | March 31, 2019 |  |  | December 31, 2018 |
Beginning balance |  | $ | 916 |  |  | $ | 3,149 |
Change in fair value |  |  | (210 | ) |  |  | (2,233 | )
Ending balance |  | $ | 706 |  |  | $ | 916 |
| The following table summarizes the change in our Level 3 warrant liability value (in thousands):
|  | Years ended December 31, |
Warrant liability |  | 2018 |  |  | 2017 |
Beginning balance |  | $ | 3,149 |  |  | $ | — |
Change in fair value |  |  | (2,233 | ) |  |  | — |
Ending balance |  | $ | 916 |  |  | $ | — |
Fair Value and Carrying Value of Long-term Debt |  | At December 31, 2018 and 2017, the aggregate fair value and the carrying value of the Company’s long-term debt were as follows (in thousands):
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Fair Value |  |  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |
Debt |  | $ | 14,043 |  |  | $ | 14,202 |  |  | $ | 13,427 |  |  | $ | 13,624 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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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