Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Stock Based Compensation Plans (Summary of Stock Option Activity) (Detail) - Employee Stock Option [Member]
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Number of Options outstanding  
Outstanding, Beginning Balance | shares 1,084,298
Granted | shares 362,000
Exercised | shares (35,375)
Expired or Forfeited | shares (25,432)
Outstanding, Ending Balance | shares 1,385,491
Weighted Average Exercise Price  
Outstanding, Beginning Balance | $ / shares $ 4.76
Granted | $ / shares 5.87
Exercised | $ / shares 2.4
Expired or Forfeited | $ / shares 8.16
Outstanding, Ending Balance | $ / shares $ 4.97