Stock-Based Awards - Summary of Stock Options Outstanding (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at December 31, 2015 | shares	1,544,597
Weighted- Average Remaining Contractual Life in Years	3 years 6 months
Weighted- Average Exercise Price, option outstanding	$ 2.62
Number Exercisable at December 31, 2015 | shares	1,469,597
Weighted- Average Exercise Price, option exercisable	$ 2.50
Aggregate Intrinsic Value at December 31, 2015 | $	$ 19,370
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 0.70
Upper range limit	$ 0.70
Number Outstanding at December 31, 2015 | shares	435,000
Weighted- Average Remaining Contractual Life in Years	3 years 1 month 6 days
Weighted- Average Exercise Price, option outstanding	$ 0.70
Number Exercisable at December 31, 2015 | shares	435,000
Weighted- Average Exercise Price, option exercisable	$ 0.70
Aggregate Intrinsic Value at December 31, 2015 | $	$ 6,516
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 1.07
Upper range limit	$ 1.07
Number Outstanding at December 31, 2015 | shares	263,635
Weighted- Average Remaining Contractual Life in Years	1 year 3 months 18 days
Weighted- Average Exercise Price, option outstanding	$ 1.07
Number Exercisable at December 31, 2015 | shares	263,635
Weighted- Average Exercise Price, option exercisable	$ 1.07
Aggregate Intrinsic Value at December 31, 2015 | $	$ 3,852
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 2.09
Upper range limit	$ 2.26
Number Outstanding at December 31, 2015 | shares	396,426
Weighted- Average Remaining Contractual Life in Years	3 years 4 months 24 days
Weighted- Average Exercise Price, option outstanding	$ 2.20
Number Exercisable at December 31, 2015 | shares	396,426
Weighted- Average Exercise Price, option exercisable	$ 2.20
Aggregate Intrinsic Value at December 31, 2015 | $	$ 5,345
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 5.05
Upper range limit	$ 5.05
Number Outstanding at December 31, 2015 | shares	285,000
Weighted- Average Remaining Contractual Life in Years	5 years 1 month 6 days
Weighted- Average Exercise Price, option outstanding	$ 5.05
Number Exercisable at December 31, 2015 | shares	210,000
Weighted- Average Exercise Price, option exercisable	$ 5.05
Aggregate Intrinsic Value at December 31, 2015 | $	$ 2,232
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 6.36
Upper range limit	$ 6.82
Number Outstanding at December 31, 2015 | shares	74,536
Weighted- Average Remaining Contractual Life in Years	5 years 4 months 24 days
Weighted- Average Exercise Price, option outstanding	$ 6.46
Number Exercisable at December 31, 2015 | shares	74,536
Weighted- Average Exercise Price, option exercisable	$ 6.46
Aggregate Intrinsic Value at December 31, 2015 | $	$ 687
Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 7.01
Upper range limit	$ 8.51
Number Outstanding at December 31, 2015 | shares	90,000
Weighted- Average Remaining Contractual Life in Years	5 years 8 months 12 days
Weighted- Average Exercise Price, option outstanding	$ 7.48
Number Exercisable at December 31, 2015 | shares	90,000
Weighted- Average Exercise Price, option exercisable	$ 7.48
Aggregate Intrinsic Value at December 31, 2015 | $	$ 738