Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Common Stock Warrants Issued and Outstanding (Parenthetical) (Details)

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Convertible Preferred Stock Warrants and Common Stock Warrants - Schedule of Common Stock Warrants Issued and Outstanding (Parenthetical) (Details) - shares
Jun. 30, 2017
Mar. 31, 2017
The March 2017 Preferred stock warrant    
Class Of Warrant Or Right [Line Items]    
Number of shares called by warrant 61,363 76,704