Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation Plans (Summary of Stock Option Activity) (Detail)

v3.8.0.1
Stock Based Compensation Plans (Summary of Stock Option Activity) (Detail) - Employee Stock Option [Member]
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Number of Options  
Outstanding, Beginning Balance | shares 1,084,298
Granted | shares 427,500
Exercised | shares (63,187)
Expired or Forfeited | shares (30,802)
Outstanding, Ending Balance | shares 1,417,809
Weighted Average Exercise Price  
Outstanding, Beginning Balance | $ / shares $ 4.76
Granted | $ / shares 6
Exercised | $ / shares 2.89
Expired or Forfeited | $ / shares 9.35
Outstanding, Ending Balance | $ / shares $ 5