Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Stock Options Activity (Detail)

v3.10.0.1
Common Stock - Summary of Stock Options Activity (Detail)
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Optioned Common Shares, Beginning Balance | shares 111,578
Number of Optioned Common Shares, Forfeited | shares (393)
Number of Optioned Common Shares, Ending Balance | shares 111,185
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 80.01
Weighted Average Exercise Price, Forfeited | $ / shares 160.79
Weighted Average Exercise Price, Ending Balance | $ / shares $ 79.73