Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Stock Options Activity (Detail)

v3.19.2
Common Stock - Summary of Stock Options Activity (Detail) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of Optioned Common Shares, Beginning Balance 665,585  
Number of Optioned Common Shares, Granted 345,350 0
Number of Optioned Common Shares, Ending Balance 1,010,935  
Weighted Average Exercise Price, Beginning Balance $ 15.65  
Weighted Average Exercise Price, Granted 1.73  
Weighted Average Exercise Price, Ending Balance $ 10.90