Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Performance Share Units - Additional Information (Detail)

v3.20.1
Stock Based Compensation - Performance Share Units - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance based equity plan market capitalization minimum amount     $ 100,000,000
Performance based equity plan market capitalization maximum amount     $ 1,100,000,000
Performance Shares [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 434,000   0
Share based compensation arrangement by share based payment award equity instruments other than options grants in period fair value   $ 3,218,000  
Share based compensation arrangement by share based payment award unamortized value $ 806,172    
Share based compensation arrangement by share based payment award unamortized weighted average period 1 year    
Performance Shares and Inducement Award [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   1,342,061  
Inducement PSU Award [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   63,908  
Performance Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense $ 88,348 $ 819,816  
Performance Based Equity Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of performance share units to be earned on achievement of market capitalization growth     100.00%
2015 Performance Share Unit Plan [Member] | Employee [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 434,000    
2015 Performance Share Unit Plan [Member] | Performance Shares [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   1,278,153