Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Activity (Detail)

v3.6.0.2
Share-Based Compensation - Summary of Activity (Detail) - 2009 Long-Term Incentive Plan [Member]
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1, 2016 1,478,724
Option grants 315,000
Exercised options (1,032,174)
Cancelled or forfeited options (238,700)
Outstanding at December 31, 2016 1,351,194
Exercisable options at December 31, 2016 121,950
Weighted Average Exercise Price  
Outstanding at January 1, 2016 | $ / shares $ 6.16
Option grants | $ / shares 7.66
Exercised options | $ / shares 6.01
Cancelled or forfeited options | $ / shares 6.42
Outstanding at December 31, 2016 | $ / shares 2.76
Exercisable options at December 31, 2016 | $ / shares $ 6.35
Weighted Average Remaining Contractual Life (in years)  
Outstanding at December 31, 2016 6 years
Exercisable options at December 31, 2016 7 years 9 months 18 days
Aggregate Intrinsic Value  
Outstanding at December 31, 2016 | $ $ 7,958,325
Exercisable options at December 31, 2016 | $ $ 280,553
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock unit grants 828,344