Quarterly report pursuant to Section 13 or 15(d)

Debt and Other Financing Arrangements - Schedule of Debt (Detail)

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Debt and Other Financing Arrangements - Schedule of Debt (Detail) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Notes payable $ 4,282,858 $ 42,875
Financing agreement with FlatIron capital maturing in May 31, 2019 [Member]    
Debt Instrument [Line Items]    
Notes payable 17,284 $ 42,875
Promissory note issued by a financial institution [Member]    
Debt Instrument [Line Items]    
Notes payable 683,592  
Convertible Senior Note [Member]    
Debt Instrument [Line Items]    
Notes payable $ 3,581,982