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Notes Payable - Schedule of Notes Payable (Parenthetical) (Detail) - Notes Payable [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Aug. 15, 2018
10% Promissory Note Due on Demand [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 10.00% 10.00%  
8% Convertible Promissory Note Due March 2019 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 8.00% 8.00%  
Notes payable, maturity date Mar. 31, 2019 Mar. 31, 2019  
8% Secured Promissory Notes Due July/August 2018 In Default [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 8.00% 8.00%  
Notes payable, maturity date, description July/August 2018 July/August 2018  
0% Promissory Notes Due January and March 2018 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 0.00% 0.00%  
Notes payable, maturity date, description January and March 2018 January and March 2018  
0% Promissory Notes Due May 2018 In Default [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 0.00% 0.00%  
Notes payable, maturity date May 31, 2018 May 31, 2018  
8% Promissory Notes In Default [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 8.00% 8.00%  
8% Promissory Notes Due March 2019 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 8.00% 8.00%  
Notes payable, maturity date Mar. 31, 2019 Mar. 31, 2019  
8% Secured Promissory Notes Due March 2019 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 8.00% 8.00%  
Notes payable, maturity date Mar. 31, 2019 Mar. 31, 2019  
0% Convertible Notes Due January 2021 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 0.00% 0.00% 0.00%
Notes payable, maturity date Jan. 31, 2021 Jan. 31, 2021  
4% Promissory Note Due April 2021 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 4.00% 4.00%  
Notes payable, maturity date Apr. 30, 2021 Apr. 30, 2021  
0% Promissory Note Due November 2018 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 0.00% 0.00%  
Notes payable, maturity date Nov. 30, 2018 Nov. 30, 2018  
0% Promissory Note Due April 2019 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 0.00% 0.00%  
Notes payable, maturity date Apr. 30, 2019 Apr. 30, 2019  
8% Promissory Note Due March 2021 [Member]      
Debt Instrument [Line Items]      
Notes payable, interest rate 8.00% 8.00%  
Notes payable, maturity date Mar. 31, 2021 Mar. 31, 2021