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Common Stock and Preferred Stock - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
director
shares
Jan. 31, 2018
USD ($)
ExecutiveOfficers
shares
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
USD ($)
ExecutiveOfficers
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
shares
Class of Stock [Line Items]                
Dividends     $ 0   $ 0 $ 0 $ 0  
Executive officer                
Class of Stock [Line Items]                
Restricted stock issued (in shares) | shares 3,061,224 1,914,894            
Restricted stock issued, value $ 4,500,000 $ 4,500,000            
Number of executive officers 2 2   2        
Executive officer | Restricted Stock                
Class of Stock [Line Items]                
Vesting period   3 years            
Shares surrendered (in shares) | shares     24,281 143,913       42,346
Value of shares surrendered     $ 25,000 $ 215,000       $ 98,000
Non-employee directors                
Class of Stock [Line Items]                
Restricted stock issued (in shares) | shares 328,230 249,480            
Restricted stock issued, value $ 500,000 $ 600,000            
Number of non-employee directors | director 6