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Warrants (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of income (expense) related to warranty liability The following table provides income (expense) related to the warrant liability which the Company records net within other income (expense) in the condensed consolidated statements of operations:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Income (expense) from change in fair value of warrant liability
 
$
—

 
$
(2,629
)
 
$
(1,182
)
 
$
(3,083
)