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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following table provides information by level for liabilities that are measured at fair value using significant unobservable inputs (Level 3) (in thousands):
Warrant liability as of December 31, 2017
 
$
1,669

Adoption of accounting guidance
 
(46
)
Change in fair value of warrants
 
(259
)
Reclassification to equity resulting from warrant exchange agreement
 
(1,364
)
Warrant liability as of June 30, 2018
 
$
—