Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Additional Information (Detail)

v3.19.1
Stock Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 08, 2019
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options   $ 0.1  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition   2 years  
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 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   $ 2.56  
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value   $ 0.3 $ 0.3
Employee Stock Option [Member] | Subsequent Event [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 8,000,000    
Number of additional shares authorized 3,000,000