v3.19.2
Stock-Based Compensation - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Installment
shares
Mar. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 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     $ 0    
Fully-vested and exercisable stock options outstanding, number of shares 2,000 2,000     2,000    
Fully-vested and exercisable stock options outstanding, weighted average exercise price | $ / shares $ 34.54 $ 34.54     $ 34.54    
Fully-vested and exercisable stock options outstanding, weighted average remaining contractual life         2 years 10 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 | $   $ 1,779,000          
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     2,000    
Common stock available for future issuance 5,000 5,000     5,000