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Investments (Tables)
 12 Months Ended
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