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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Measurements [Abstract]  
Fair Value Measurements by Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table summarizes fair value measurements by level at June 30, 2017 for assets and liabilities measured at fair value on a recurring basis:
(In thousands)
 
Level I
  
Level II
  
Level III
  
Total
 
Cash equivalents
 
$
53,485
  
$
—
  
$
—
  
$
53,485
 
Warrant liabilities
  
—
   
—
   
(6,567
)
  
(6,567
)

The following table summarizes fair value measurements by level at December 31, 2016 for assets and liabilities measured at fair value on a recurring basis:
(In thousands)
 
Level I
  
Level II
  
Level III
  
Total
 
Cash equivalents
 
$
56,276
  
$
—
  
$
—
  
$
56,276
 
Warrant liabilities
  
—
   
—
   
(3,789
)
  
(3,789
)