v3.20.1
Notes Payable - Schedule of Notes Payable (Parenthetical) (Detail) - Notes Payable [Member]
1 Months Ended 12 Months Ended
Aug. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Aug. 31, 2017
8% Secured Promissory Notes Due February 2019 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   8.00% 8.00%   8.00%
Notes payable, maturity date   Feb. 28, 2019 Feb. 28, 2019    
0% Convertible Notes Due January 2021 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   0.00% 0.00%    
Notes payable, maturity date   Jan. 31, 2021 Jan. 31, 2021    
4% Promissory Note Due December 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   4.00% 4.00%    
Notes payable, maturity date   Dec. 31, 2020 Dec. 31, 2020    
8% Promissory Note Due March 2021 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   8.00% 8.00% 8.00%  
Notes payable, maturity date   Mar. 31, 2021 Mar. 31, 2021    
0% Promissory Note Due April 2019 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate 0.00% 0.00% 0.00%    
Notes payable, maturity date Apr. 30, 2019 Apr. 30, 2019 Apr. 30, 2019    
12% Convertible Notes Due October 2019 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   Oct. 31, 2019 Oct. 31, 2019    
12% Convertible Notes Due November 2019 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   Nov. 30, 2019 Nov. 30, 2019    
12% Convertible Notes Due May 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   May 31, 2020 May 31, 2020    
12% Convertible Notes Due July 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   Jul. 31, 2020 Jul. 31, 2020    
12% Convertible Notes Due August 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   Aug. 31, 2020 Aug. 31, 2020    
12% Convertible Notes Due September 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   Sep. 30, 2020 Sep. 30, 2020    
12% Secured Promissory Note Due September 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable, interest rate   12.00% 12.00%    
Notes payable, maturity date   Sep. 30, 2020 Sep. 30, 2020