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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 9 Months Ended
Jun. 01, 2018
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Installment
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Plan
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of equity incentive plans | Plan         2  
Compensation expense | $   $ 0   $ 0 $ 0 $ 0
Stock options granted under equity incentive plans         0 0
Unrecognized compensation expense related to non-vested stock options | $   $ 0     $ 0  
Number of stock options expired without being exercised         26,000  
Fully-vested and exercisable stock options outstanding, number of shares   8,000     8,000  
Fully-vested and exercisable stock options outstanding, weighted average exercise price | $ / shares   $ 29.07     $ 29.07  
Fully-vested and exercisable stock options outstanding, weighted average remaining contractual life         2 years 6 months 3 days  
Total value of restricted stock award | $     $ 200,000      
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares issued 885,346 59,000        
Number of shares issued, value | $   $ 260,000        
Restricted Stock Award [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense | $   130,000     $ 270,000  
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] | Prepaid Assets [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to non-vested restricted stock award | $   $ 190,000     $ 190,000  
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option exercisable period         7 years  
2006 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares outstanding under equity incentive plans   4,000     4,000  
Common stock available for future issuance   1,000     1,000  
2015 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares outstanding under equity incentive plans   3,000     3,000  
Common stock available for future issuance   1,000     1,000