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Warrants (Details) - USD ($)
$ / shares in Units, $ in Millions
Jun. 26, 2018
Jun. 30, 2018
Class of Stock [Line Items]    
Warrants exercised (in shares) 332,896  
Level 3    
Class of Stock [Line Items]    
Warrant liability, fair value $ 6.8  
Secured Loan Arrangement    
Class of Stock [Line Items]    
Warrants outstanding (in shares)   376,691
Warrants exercise price (in dollars per share)   $ 2.3229