v3.19.3
Stock-Based Compensation - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
Installment
shares
Mar. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Mar. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense | $   $ 0   $ 0     $ 0 $ 0  
Stock options granted under equity incentive plans   0   0     0 0  
Unrecognized compensation expense related to non-vested stock options | $   $ 0         $ 0    
Fully-vested and exercisable stock options outstanding, number of shares   2,000         2,000    
Fully-vested and exercisable stock options outstanding, weighted average exercise price | $ / shares   $ 34.54         $ 34.54    
Fully-vested and exercisable stock options outstanding, weighted average remaining contractual life             2 years 7 months 17 days    
Total value of restricted stock award | $         $ 200,000        
Number of shares granted, value | $         $ 3,585,000 $ 1,750,000      
Directors and Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense | $   $ 24,000 $ 1,750,000            
Number of shares granted     600,000            
Number of shares granted, value | $     $ 1,560,000            
Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total value of restricted stock award | $     $ 260,000            
Number of restricted shares granted     100,000            
Termination of Chief Financial Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted 53,571                
Number of shares granted, value | $ $ 108,000                
Restricted Stock Award [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted         42,000        
Number of shares vested         17,000        
Number of shares expected to vest         25,000        
Number of equal vesting installments | Installment         4        
Restricted Stock Award [Member] | Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted, vesting period     2 years            
Restricted Stock Award [Member] | Termination of Chief Financial Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares vested in period 26,667                
Number of shares vested in period, value | $ $ 69,000                
Restricted Stock Award [Member] | Prepaid Assets [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unrecognized compensation expense related to non-vested restricted stock award | $                 $ 30,000
Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock option exercisable period             7 years    
2015 Equity Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares outstanding under equity incentive plans   2,000         2,000    
Common stock available for future issuance   5,000         5,000