Quarterly report pursuant to Section 13 or 15(d)

Warrants - Schedule of Warrants Issued and Outstanding (Details)

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Warrants - Schedule of Warrants Issued and Outstanding (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Class Of Warrant Or Right [Line Items]    
Number of warrant shares 956 156,294
Issuance Date, November 2012 Tranche One    
Class Of Warrant Or Right [Line Items]    
Exercise price $ 6.00 $ 6.00
Number of warrant shares 7 7
Year of expiration 2028 2028
Issuance Date, November 2012 Tranche Two    
Class Of Warrant Or Right [Line Items]    
Exercise price $ 6.00 $ 6.00
Number of warrant shares 927 927
Year of expiration 2020 2020
Issuance Date, November 2012 Tranche Three    
Class Of Warrant Or Right [Line Items]    
Exercise price $ 14.50 $ 14.50
Number of warrant shares 22 22
Year of expiration 2028 2028
Issuance Date, August 2016    
Class Of Warrant Or Right [Line Items]    
Exercise price   $ 0.15
Number of warrant shares   155,338
Year of expiration   2023