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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017:
 
 
September 30, 2018
 
December 31, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Cash and cash equivalents
 
$
45,657

 
$
—

 
$
—

 
$
42,337

 
$
—

 
$
—