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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
 
March 31, 2017
 
December 31, 2016
 
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents
 
$
31,507

 
$

 
$

 
$
57,706

 
$

 
$