Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plan - Summary of Stock Option Activity (Detail)

v3.19.1
Stock Compensation Plan - Summary of Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Outstanding, beginning balance 260,633 162,153
Number of Options, Forfeited (1,500) (7,120)
Number of Options, Granted 1,553,000 105,600
Number of Options, Outstanding, ending balance 1,812,133 260,633
Number of Options, Exercisable 1,034,127  
Weighted Average Exercise Price, Outstanding, beginning balance $ 9.00 $ 12.80
Weighted Average Exercise Price, Forfeited 104.00 16.50
Weighted Average Exercise Price, Granted 0.80 3.70
Weighted Average Exercise Price, Outstanding, ending balance 1.89 9.00
Weighted Average Exercise Price, Exercisable 2.57  
Option Price Per Share, forfeited 104.00  
Option Price Per Share, granted   3.70
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option Price Per Share, beginning balance 3.70 5.50
Option Price Per Share, forfeited   6.20
Option Price Per Share, granted 0.73  
Option Price Per Share, ending balance 0.73 3.70
Option Price Per Share, exercisable 0.73  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option Price Per Share, beginning balance 104.00 104.00
Option Price Per Share, forfeited   54.00
Option Price Per Share, granted 1.52  
Option Price Per Share, ending balance 100.00 $ 104.00
Option Price Per Share, exercisable $ 100.00