Annual report pursuant to Section 13 and 15(d)

Summary of Option Activity (Detail)

v3.3.1.900
Summary of Option Activity (Detail) - Long Term Incentive Plan, Two Thousand Nine and Nineteen Ninety Nine
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1, 2015 | shares 1,448,684
Granted | shares 514,610
Exercised | shares (28,836)
Cancelled or forfeited | shares (455,734)
Outstanding at December 31, 2015 | shares 1,478,724
Exercisable at December 31, 2015 | shares 804,484
Weighted Average Exercise Price  
Outstanding at January 1, 2015 | $ / shares $ 6.17
Granted | $ / shares 6.09
Exercised | $ / shares 5.54
Cancelled or forfeited | $ / shares 6.06
Outstanding at December 31, 2015 | $ / shares 6.19
Exercisable at December 31, 2015 | $ / shares $ 5.90
Weighted Average Remaining Contractual Life (in years)  
Outstanding at December 31, 2015 5 years 9 months 18 days
Exercisable at December 31, 2015 3 years 8 months 12 days
Aggregate Intrinsic Value  
Outstanding at December 31, 2015 | $ $ 622,420
Exercisable at December 31, 2015 | $ $ 504,629