Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plan - Additional Information (Detail)

v3.19.1
Stock Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants in Period   0
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options $ 0.3  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 1 year 10 months 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   211,658
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0  
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, number of shares authorized 5,000,000  
Share price $ 2.09  
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value $ 0.3 $ 0.9