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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, All Other Investments [Abstract] |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] | For the period from the IPO on May 17, 2017 to December 31, 2017 and for the year ended December 31, 2018, the accompanying consolidated statements of operations reflected the following (in thousands):
|  | 2018 |  | 2017
Gain on conversion of loans and accrued interest(1) |  | $ | — |  |  | $ | 2,671 |
Gain on exercise of warrant(2) |  | — |  |  | 4,616 |
Change in fair value of investment, warrants |  | (11,895 | ) |  | 8,317 |
Change in fair value of investment, common stock |  | (47,208 | ) |  | 33,922 |
Loss on sale of investment, common stock |  | (19,095 | ) |  | — |
Net realized and unrealized gain (loss) on investment at fair value |  | $ | (78,198 | ) |  | $ | 49,526 |

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + 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)(1) -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 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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