Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Stock Options Activity (Detail)

v3.19.3
Common Stock - Summary of Stock Options Activity (Detail)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Optioned Common Shares, Beginning Balance | shares 665,585
Number of Optioned Common Shares, Granted | shares 345,350
Number of Optioned Common Shares, Ending Balance | shares 1,010,935
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 15.65
Weighted Average Exercise Price, Granted | $ / shares 1.73
Weighted Average Exercise Price, Ending Balance | $ / shares $ 10.90