v3.19.1
Notes Payable - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 15, 2018
USD ($)
Jan. 31, 2018
USD ($)
$ / shares
shares
Apr. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
$ / shares
shares
Oct. 31, 2018
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
PromissoryNote
Aug. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Aug. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                        
Notes payable, outstanding amount                   $ 8,833,000   $ 9,117,000
Convertible notes converted into shares of common stock | shares   570,287                    
Warrants exercisable into shares of common stock | shares   570,287                    
Exercise price of warrants, per share | $ / shares   $ 9.15                    
Amortization of debt discount   $ 271,000               1,259,000   1,780,000
Amortization period of interest expense   3 years                    
Loss on debt conversion                   9,000    
Accretion of discount                   (521,000) $ (60,000)  
Notes remaining balance paid                   284,000    
Convertible Notes and Warrants [Member]                        
Debt Instrument [Line Items]                        
Convertible notes term   3 years                    
Notes payable, interest rate   0.00%                    
Notes payable, outstanding amount $ 275,000                      
Convertible notes amount   $ 1,000,000                    
Warrants value   127,000                    
Conversion feature value   144,000                    
Debt value   $ 729,000                    
Aggregate principal amount of converted notes to common stock 725,000                      
Accretion of discount                   6,000    
Convertible Notes and Warrants [Member] | Interest Expense [Member]                        
Debt Instrument [Line Items]                        
Loss on debt conversion $ 163,000                      
Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption   105                    
Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption   2.20                    
Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Entity Credit Risk [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption   7.70                    
Notes Payable [Member]                        
Debt Instrument [Line Items]                        
Interest expense                   $ 728,000 $ 247,000  
8% Secured Promissory Notes Due August 2018 [Member]                        
Debt Instrument [Line Items]                        
Notes payable, outstanding amount                       $ 250,000
8% Secured Promissory Notes Due August 2018 [Member] | Notes Payable [Member]                        
Debt Instrument [Line Items]                        
Notes payable, issued amount                 $ 250,000      
Convertible notes term                 1 year      
Notes payable, interest rate                 8.00% 8.00%   8.00%
Notes payable, outstanding amount                 $ 250,000      
Notes payable, maturity date                   Aug. 31, 2018   Aug. 31, 2018
4.02% Promissory Note Due April 2021 [Member] | Notes Payable [Member]                        
Debt Instrument [Line Items]                        
Notes payable, issued amount               $ 1,000,000   $ 813,000    
Notes payable, interest rate               4.02%        
Notes payable, maturity date               Apr. 30, 2021        
Annual principal payments,2019               $ 305,000        
Annual principal payments,2020               359,000        
Annual principal payments,2021               $ 183,000        
0% Promissory Note Due April 2019 [Member]                        
Debt Instrument [Line Items]                        
Notes payable, outstanding amount                   $ 418,000   $ 418,000
0% Promissory Note Due April 2019 [Member] | Notes Payable [Member]                        
Debt Instrument [Line Items]                        
Notes payable, interest rate                   0.00%   0.00%
Notes payable, maturity date                   Apr. 30, 2019   Apr. 30, 2019
0% Promissory Note Due April 2019 [Member] | Notes Payable [Member] | Unitron Assets [Member]                        
Debt Instrument [Line Items]                        
Notes payable, interest rate             0.00%          
Notes payable, maturity date             Apr. 30, 2019          
Assumption of debt under merger consideration             $ 868,000          
Notes payable, maturity date, description             $450,000 paid in October 2018 and $418,000 paid in April 2019          
0% Promissory Note Due April 2019 [Member] | Notes Payable [Member] | Unitron Assets [Member] | Subsequent Events [Member]                        
Debt Instrument [Line Items]                        
Notes remaining balance paid     $ 418,000                  
0% Promissory Note Due October 2018 [Member] | Notes Payable [Member] | Unitron Assets [Member]                        
Debt Instrument [Line Items]                        
Notes payable, interest rate             0.00%          
Notes payable, maturity date             Oct. 31, 2018          
Notes remaining balance paid         $ 450,000              
8% Promissory Note Due March 2021 [Member]                        
Debt Instrument [Line Items]                        
Notes payable, outstanding amount                   $ 2,107,000   $ 2,107,000
8% Promissory Note Due March 2021 [Member] | Notes Payable [Member]                        
Debt Instrument [Line Items]                        
Notes payable, issued amount           $ 2,107,000            
Notes payable, interest rate           8.00%       8.00%   8.00%
Notes payable, maturity date                   Mar. 31, 2021   Mar. 31, 2021
Number of promissory notes | PromissoryNote           12            
12% Convertible Notes Due October 2019 [Member]                        
Debt Instrument [Line Items]                        
Notes payable, outstanding amount                   $ 4,000,000   $ 4,000,000
Convertible notes converted into shares of common stock | shares         941,181              
Warrants exercisable into shares of common stock | shares         470,592              
Exercise price of warrants, per share | $ / shares         $ 4.25              
Amortization of debt discount         $ 1,942,000              
Amortization period of interest expense         1 year              
12% Convertible Notes Due October 2019 [Member] | Convertible Notes and Warrants [Member]                        
Debt Instrument [Line Items]                        
Convertible notes term         1 year              
Notes payable, interest rate         12.00%              
Convertible notes amount         $ 4,000,000              
Warrants value         769,000              
Conversion feature value         1,173,000              
Debt value         $ 2,058,000              
Accretion of discount                   $ 486,000    
12% Convertible Notes Due October 2019 [Member] | Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption         90              
12% Convertible Notes Due October 2019 [Member] | Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption         2.47              
12% Convertible Notes Due October 2019 [Member] | Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Discount Rate [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption         25              
12% Convertible Notes Due October 2019 [Member] | Notes Payable [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, outstanding amount                   $ 1,220,000   $ 1,220,000
Convertible notes converted into shares of common stock | shares       277,274                
Warrants exercisable into shares of common stock | shares       138,638                
Exercise price of warrants, per share | $ / shares       $ 4.40                
Amortization of debt discount       $ 118,000                
Amortization period of interest expense       1 year                
12% Convertible Notes Due November 2019 [Member] | Convertible Notes and Warrants [Member]                        
Debt Instrument [Line Items]                        
Convertible notes term       1 year                
Notes payable, interest rate       12.00%                
Convertible notes amount       $ 1,220,000                
Warrants value       118,000                
Debt value       $ 1,102,000                
Accretion of discount                   $ 29,000    
12% Convertible Notes Due November 2019 [Member] | Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption       90                
12% Convertible Notes Due November 2019 [Member] | Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption       2.52                
12% Convertible Notes Due November 2019 [Member] | Warrants [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Discount Rate [Member]                        
Debt Instrument [Line Items]                        
Fair value assumption       25                
12% Convertible Notes Due November 2019 [Member] | Notes Payable [Member]                        
Debt Instrument [Line Items]                        
Notes payable, interest rate                   12.00%   12.00%
Notes payable, maturity date                   Nov. 30, 2019   Nov. 30, 2019