Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Detail)

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Related Party Transactions (Detail) - USD ($)
12 Months Ended
Jun. 06, 2019
May 06, 2019
Jun. 01, 2018
May 25, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 03, 2010
Related Party Transaction [Line Items]                  
Fair value of options         $ 5,500,000 $ 5,500,000 $ 3,600,000    
Common stock, fair value (in dollars per share)         $ 3.60 $ 2.67      
Options, grants in period, grant price (in dollars per share)         $ 5.77        
Executive Vice President                  
Related Party Transaction [Line Items]                  
Number of securities called by warrants or rights (in shares)                 450,000
Retainer compensation   $ 5,000              
Related party transaction, expenses from transactions with related party         $ 93,000.0 $ 163,000.0 242,000.0    
Payment of annual bonus compensation         0 58,000.0 31,900    
Related party transaction, compensation for services on board         $ 51,300 $ 50,000.0 $ 50,000.0    
Common stock shares granted (in shares) 4,269   3,017 10,000          
Fair value of options $ 34,762   $ 11,284 $ 24,700          
Common stock, fair value (in dollars per share) $ 8.14   $ 3.74 $ 2.47          
Options, grants in period, grant price (in dollars per share) $ 22.52   $ 11.60 $ 7.27          
Restricted Stock                  
Related Party Transaction [Line Items]                  
Restricted common stock shares granted (in shares)         230,980 87,811 372,711    
Restricted stock, fair value per share (in dollars per share)         $ 15.75 $ 9.01 $ 7.27 $ 3.59  
Restricted Stock | Executive Vice President                  
Related Party Transaction [Line Items]                  
Restricted common stock shares granted (in shares) 3,419   6,897 8,667          
Fair value of restricted stock $ 76,996   $ 80,005 $ 63,009          
Restricted stock, fair value per share (in dollars per share) $ 22.52   $ 11.60 $ 7.27