v3.20.2
Notes Payable - Schedule of Notes Payable (Detail) - USD ($)
Aug. 01, 2020
May 02, 2020
Mar. 31, 2020
Feb. 01, 2020
Dec. 31, 2019
Oct. 31, 2019
Sep. 30, 2019
May 31, 2019
Nov. 30, 2018
Oct. 31, 2018
Jan. 31, 2018
Debt Instrument [Line Items]                      
Total face amount $ 4,848,000   $ 1,800,000 $ 16,359,000 $ 16,359,000   $ 24,200,000        
Unamortized discount       (2,674,000) (3,047,000)           $ (271,000)
Total carrying value 4,848,000     13,685,000 13,312,000            
Amount classified as current 2,049,000     13,685,000 13,227,000            
Amount classified as long-term 2,799,000       85,000            
0% Convertible Note Due January 2021 [Member]                      
Debt Instrument [Line Items]                      
Total face amount       91,000 91,000            
6% Promissory Note Due December 2020 [Member]                      
Debt Instrument [Line Items]                      
Total face amount 500,000     500,000 500,000            
12% Convertible Notes Due October 2019 [Member]                      
Debt Instrument [Line Items]                      
Total face amount       1,775,000 1,775,000            
Unamortized discount                   $ (1,942,000)  
12% Convertible Notes Due November 2019 [Member]                      
Debt Instrument [Line Items]                      
Total face amount       400,000 400,000 $ 400,000          
Unamortized discount                 $ (118,000)    
12% Convertible Notes Due May 2020 [Member]                      
Debt Instrument [Line Items]                      
Total face amount       1,500,000 1,500,000            
Unamortized discount               $ (940,000)      
12% Convertible Notes Due July, August and September 2020 [Member]                      
Debt Instrument [Line Items]                      
Total face amount       4,235,000 4,235,000   4,235,000        
Unamortized discount   $ (4,368,000)         $ (4,368,000)        
12% Secured Promissory Note Due September 2020 [Member]                      
Debt Instrument [Line Items]                      
Total face amount       $ 7,858,000 $ 7,858,000            
6% Promissory Note Due February 2024 [Member]                      
Debt Instrument [Line Items]                      
Total face amount 1,250,000                    
1% Promissory Note Due April 2022 [Member]                      
Debt Instrument [Line Items]                      
Total face amount $ 3,098,000