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Preferred Stock - General Information (Details)
Jun. 30, 2018
$ / shares
shares
Convertible preferred stock  
Convertible preferred stock, shares authorized (in shares) 25,000,000
Convertible preferred stock, par value (in dollars per share) | $ / shares $ 0.001
Convertible preferred stock, shares issued (in shares) 0
Convertible preferred stock, shares outstanding (in shares) 0