Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plan - Additional Information (Detail)

v3.20.1
Stock Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 05, 2019
Jul. 05, 2019
May 14, 2019
May 08, 2019
Dec. 31, 2019
Dec. 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         1 year 7 months 6 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         497,051  
Expected term of award         6 years 8 months 12 days 7 years 4 months 24 days
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term of award         10 years  
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term of award         6 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
Restricted Stock [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period         5 years  
Restricted Stock [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period         1 year  
Restricted Stock [Member] | Management [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       270,012    
Restricted Stock [Member] | Executive Officer [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 66,667          
Restricted Stock [Member] | Executive Officer            
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   41,323 119,049      
Vesting period   2 years        
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       8,000,000    
Number of additional shares authorized       3,000,000    
Share price         $ 1.44  
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value         $ 0.7 $ 0.3
Employee Stock Option [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period         5 years  
Employee Stock Option [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period         4 years