Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Stock Option Plans (Summary of Stock Option Activity) (Detail) - Employee Stock Option [Member]
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of Options outstanding  
Outstanding, Beginning Balance | shares 1,084,298
Granted | shares 0
Exercised | shares (35,000)
Expired or Forfeited | shares (7,619)
Outstanding, Ending Balance | shares 1,041,679
Weighted Average Exercise Price  
Outstanding, Beginning Balance | $ / shares $ 4.76
Granted | $ / shares 0
Exercised | $ / shares 2.4
Expired or Forfeited | $ / shares 17.5
Outstanding, Ending Balance | $ / shares $ 4.75