v3.21.1
Stockholders' Deficit - Additional Information (Detail)
1 Months Ended 2 Months Ended 12 Months Ended
Oct. 31, 2020
Oct. 14, 2020
shares
Sep. 30, 2019
shares
Jan. 09, 2019
USD ($)
$ / shares
shares
Jan. 31, 2018
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Aug. 31, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
Director
shares
Apr. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
ConvertibleNote
$ / shares
shares
Oct. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Feb. 29, 2020
shares
Jan. 30, 2021
USD ($)
FormerExecutive
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Feb. 01, 2020
USD ($)
shares
Nov. 30, 2019
shares
Dec. 31, 2018
shares
Jun. 30, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Preferred stock, shares authorized                             10,000,000   10,000,000      
Preferred stock, shares outstanding                             2,000   2,000      
Common stock, shares authorized                             150,000,000   150,000,000      
Common stock, shares outstanding                             11,465,000   4,378,000      
Amount owed by vendor | $                             $ 400,000          
Warrants exercisable into shares of common stock         57,029                              
Exercise price of warrants, per share | $ / shares         $ 91.50                              
Warrants exercisable expiration date           Jan. 06, 2021                            
Expected life                             5 years          
(Loss) gain on debt conversion | $                             $ 13,642,000 $ (4,057,000)        
Promissory note principal amount | $                             4,348,000   $ 16,359,000      
Debt exchange conversion aggregate amount | $                             $ 6,615,000 $ 8,001,000        
Convertible notes converted into shares of common stock         57,029                              
Warrants exercisable expiration period           4 months                            
Fair value assumption, risk-free interest rates, minimum                             0.20%          
Fair value assumption, risk-free interest rates, maximum                             0.30%          
Debt conversion, description                     Company entered into an additional debt restructuring that resulted in the conversion of debt with an aggregate principal amount of $7,492,000 and accrued interest of $691,000 into common stock of the Company. The carrying value of the debt and related derivative liability at the time of extinguishment amounted to $8,341,000. The aggregate total of $8,183,000 was converted into 4,814,000 shares of common stock at $1.70 per share.                  
Debt conversion, aggregate principal amount | $                     $ 7,492,000                  
Debt conversion, accrued interest | $                     691,000                  
Debt aggregate conversion amount | $                     8,183,000                  
Number of outside directors | Director                 2                      
Number of former executives | FormerExecutive                             3          
Reverse stock split description one-for-ten reverse stock split one-for-ten reverse split                                    
Reverse stock split, conversion ratio 0.1 0.1                                    
Term of vesting schedule                             10 years          
Vested share exercised                             3 months          
Stock options granted under equity incentive plans                           0 855,000 0        
Stock-based compensation expense | $                             $ 1,332,000          
Expected dividend yield                             0.00%          
Stock issued during period, shares                   216,000           1,851,000        
Stock issued during period, values | $                               $ 3,265,000        
Warrant unexercised           247,000                            
Warrants extend expiration period           4 months                            
Warrants, extended expiration date           May 06, 2021                            
Future stock-based compensation | $                             $ 167,000          
Immediate Vesting Options [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Expected life                             2 years 6 months          
Graded Vested Options [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Expected life                             3 years 3 months 18 days          
Minimum [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Number of shares granted, vesting period                             2 years          
Maximum [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Number of shares granted, vesting period                             3 years          
2015 Equity Incentive Plan [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock authorized for issuance there-under           1,500,000                       1,500,000 79,000 5,000
2015 Plan [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Stock issued during period, shares                               140,000        
2019 Plan [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Stock issued during period, shares                               721,000        
Number of shares vested                               130,000        
Director                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock issued                 295,000                      
Number of shares granted, value | $                 $ 390,000                      
Stock Option [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Stock-based compensation expense | $                             $ 722,000          
Unregistered Shares [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Stock issued during period, shares                   300,000           1,000,000        
Restricted Stock Award [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Stock-based compensation expense | $                             $ 93,000          
Warrants [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Exercise price of warrants, per share | $ / shares                               $ 0.50        
Convertible notes converted into shares of common stock           453,000,000                   1,000,000,000        
Stock-based compensation expense | $                   $ 127,000                    
Stock issued during period, shares                   300,000           1,000,000        
Stock issued during period, values | $           $ 227,000       $ 89,000                    
Debt instrument, term                               1 year        
Common Stock [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Fair value assumption, expected volatility                               70.00%        
(Loss) gain on debt conversion | $                     $ 6,472,000                  
Preferred stock convertible into common stock                               30,000        
Convertible notes converted into shares of common stock                     4,814,000                  
Debt exchange conversion price per unit | $ / shares                     $ 1.70                  
Debt and related derivative liability at the time of extinguishment | $                     $ 8,341,000                  
Conversions of preferred to common stock | $                     $ 1,869,000                  
Common stock issued                     1,068,000                  
Stock repurchased               70,000                        
Stock retired               70,000                        
Stock repurchased and retired value | $               $ 28,000                        
Reverse stock split description   1-for-10                                    
Reverse stock split, conversion ratio   0.1                                    
Stock issued during period, shares, reverse stock splits   2,000                                    
Expected annualized volatility rate, minimum                             95.00%          
Expected annualized volatility rate maximum                             108.00%          
Common Stock [Member] | Director                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock issued                 80,000,000                      
Number of shares granted, value | $                 $ 106,000                      
Common Stock [Member] | Former Executive                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock issued           54,000 54,000   54,000                      
Number of shares granted, value | $           $ 57,000 $ 57,000   $ 57,000                      
Common Stock [Member] | Other Expenses [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock issued                               1,040,000        
Number of shares granted, value | $                               $ 415,000        
Common Stock [Member] | Simply Mac, Inc. [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock issued                     1,040,000                  
Settlement Agreement with Vendor [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Amount owed by vendor | $       $ 164,000                                
Issuance of restricted common shares       9,345                                
Warrants exercisable into shares of common stock       9,345                 38,217              
Exercise price of warrants, per share | $ / shares       $ 16.40                                
Warrants exercisable beginning date       Jul. 09, 2019                                
Warrants exercisable expiration date       Jan. 09, 2022                                
Fair value of warrants estimated on the date of issuance | $       $ 59,000                                
Combined value of the stock and warrants | $       173,000                                
(Loss) gain on debt conversion | $       (9,000)                                
Strike price per share | $ / shares                         $ 30.20              
Aggregate proceeds from exercise of warrants | $                         $ 1,154,000              
Settlement Agreement with Vendor [Member] | Restricted Stock Award [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Fair value of restricted stock estimated on the date of issuance | $       $ 114,000,000                                
Fair value assumption, discount rate       25.00%                                
Fair value assumption, risk-free interest rates       2.52%                                
Expected life       6 months                                
Fair value assumption, expected volatility       90.00%                                
Settlement Agreement with Vendor [Member] | Warrants [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Fair value assumption, risk-free interest rates       2.54%                                
Expected life       3 years                                
Fair value assumption, expected volatility       90.00%                                
Settlement Agreement with Vendor [Member] | Common Stock [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Preferred stock convertible into common stock     30,000                                  
Exchange [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
(Loss) gain on debt conversion | $                     $ 204,000                  
Promissory note principal amount | $                     434,000 $ 7,852,000                
Promissory notes accrued interest | $                     8,000 668,000                
Carrying value of extinguishment of debt | $                       7,461,000                
Debt exchange conversion aggregate amount | $                     $ 35,000 $ 8,520,000                
Warrants exercisable expiration period                       3 years                
Number of convertible notes exchanged into common stock | ConvertibleNote                     2                  
Shares holders blocker percentage                     4.99%                  
Warrants extend expiration period                       3 years                
Exchange [Member] | Warrants [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Exercise price of warrants, per share | $ / shares                       $ 5.10                
Fair value of warrants estimated on the date of issuance | $                       $ 3,713,000                
Expected life                       3 years                
Fair value assumption, expected volatility                       70.00%                
Combined value of the stock and warrants | $                       $ 12,177,000                
(Loss) gain on debt conversion | $                       (4,048,000)                
Debt exchange conversion aggregate amount | $                       $ 8,464,000                
Each unit comprised of common stock and warrant to purchase number of common share                       1,540,000                
Fair value assumption, risk-free interest rates, minimum                       1.50%                
Fair value assumption, risk-free interest rates, maximum                       1.70%                
Exchange [Member] | Common Stock [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible notes converted into shares of common stock                     86,800 1,671,000                
Debt exchange conversion price per unit | $ / shares                     $ 5.10 $ 5.10                
Common stock issued                     5,882,000                  
Shares delivered                     270,000                  
Shares remain to be delivered                     5,612,000                  
Series A Convertible Preferred Stock [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Preferred stock, shares authorized                             10,000,000          
Preferred stock, shares outstanding                             2,000 32,000        
Percentage of outstanding shares authorized for issuance                             0.00%          
Preferred stock convertible into common stock                             30,000          
Preferred stock, conversion basis                             The preferred shares are essentially convertible into common stock of the Company on a one-for-one basis at the election of the holder.