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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Financial assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):
 
Level 1
 
Level 2
 
Level 3
Assets as of June 30, 2018:
 
 
 
 
 
Short-term investments
$
34,694

 
$
—

 
$
—

Investment at fair value (Note 5)(1)

—

 
—

 
75,004

Total recurring fair value measurements
$
34,694

 
$
—

 
$
75,004

Assets as of December 31, 2017:
 
 
 
 
 
Investment at fair value (Note 5)(1)
$
—

 
$
—

 
$
104,754
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
A reconciliation of the activity for fair value measurements categorized within Level 3 for the six months ended June 30, 2018 is as follows (in thousands):
 
Investment at Fair Value
 
Common Stock
 
Warrants
 
Total
Opening balance as of January 1, 2018
$
90,795

 
$
13,959

 
$
104,754

Total gains and losses included in earnings for the period(1)
 
 
 
 
 
Change in fair value of investment, net
(24,968
)
 
(4,782
)
 
(29,750
)
Total recurring fair value measurements(1)
$
65,827

 
$
9,177

 
$
75,004
Marketable Securities [Table Text Block]
Short-term marketable securities for the periods presented were comprised of the following (in thousands):
 
 
 
Gross Unrealized
 
 
Security Type
Cost
 
Gains
 
Losses
 
Fair Value
June 30, 2018:
 
 
 
 
 
 
 
U.S. government fixed income securities (Maturity dates in 2018)
$
34,704

 
$
1

 
$
(11
)
 
$
34,694