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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Options granted (in shares) 0     0      
Equity Incentive Plan 2010              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Options granted (in shares)   32,000 37,000       200,000
Stock Incentive Plan 2019              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares reserved for issuance 182,500       182,500    
Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Unamortized compensation cost, net of expected forfeitures $ 200,000       $ 200,000    
Weighted average expected period over which the expense is to be recognized         2 years 2 months 12 days    
Tax benefits associated with exercise of stock options $ 0     $ 0 $ 0 $ 0  
Dividend yield (as a percent)         0.00% 0.00%  
Stock options exercised         0 0  
Options | Equity Incentive Plan 2010              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Granted (in shares)         0    
Options | Stock Incentive Plan 2019              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Minimum percentage of voting rights required for applicability of a specific expiration term 10.00%       10.00%    
Maximum expiration term of options granted         5 years    
Term of plan         10 years    
Options granted (in shares) 0       0    
Options | Maximum | Stock Incentive Plan 2019              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period of replacement options         4 years    
Options | Minimum | Stock Incentive Plan 2019              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period of replacement options         3 years    
RSU's              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Weighted average expected period over which the expense is to be recognized         2 years 3 months 18 days    
Unamortized compensation cost, net of expected forfeitures $ 300,000       $ 300,000    
RSU's | Equity Incentive Plan 2010              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Total intrinsic value of the restricted stock units outstanding $ 200,000       $ 200,000    
Granted (in shares)   6,000 101,000        
RSU's | Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense, recognition period         5 years    
RSU's | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense, recognition period         3 years