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6. Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Investments [Abstract] |
Schedule of gain (loss) on investments |
|  | 2019 |  |  | 2018 |
|  | (In thousands) |
Change in fair value of investment, warrants |  | $ | (1,308 | ) |  | $ | (11,895 | )
Change in fair value of investment, common stock |  |  | 11,207 |  |  |  | (47,208 | )
Loss on sale of investment, common stock |  |  | (9,230 | ) |  |  | (19,095 | )
Net realized and unrealized gain (loss) on investment at fair value |  | $ | 669 |  |  | $ | (78,198 | )

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