Stock-Based Compensation - Schedule of Option Activity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, beginning balance	1,531,110
Options granted	281,474
Options cancelled	(39,432)
Options exercised	0
Options forfeited and expired	(592,179)
Options Outstanding, ending balance	1,180,973	1,531,110
Vested and expected to vest	1,150,453
Exercisable	877,218
Options Outstanding, beginning balance, Weighted Average Exercise Price	$ 13.57
Options granted, Weighted Average Exercise Price	12.11
Options cancelled, Weighted Average Exercise Price	19.78
Options exercised, Weighted Average Exercise Price	0
Options forfeited and expired, Weighted Average Exercise Price	17.71
Options Outstanding, ending balance, Weighted Average Exercise Price	10.95	$ 13.57
Vested and expected to vest, Weighted Average Exercise Price	10.87
Exercisable, Weighted Average Exercise Price	$ 10.05
Options Outstanding, Weighted Average Remaining Contractual Term	4 years 6 months	6 years 4 months 24 days
Vested and expected to vest, Weighted Average Remaining Contractual Term	4 years 4 months 24 days
Exercisable, Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Options Outstanding, Aggregate Intrinsic Value		$ 3,979,000
Vested and expected to vest, Aggregate Intrinsic Value	$ 0
Exercisable, Aggregate Intrinsic Value	$ 0
Time Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, beginning balance	1,146,509
Options granted	281,474
Options cancelled	(34,498)
Options exercised	0
Options forfeited and expired	(448,442)
Options Outstanding, ending balance	945,043	1,146,509
Vested and expected to vest	919,115
Exercisable	668,425
Performance Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, beginning balance	384,601
Options cancelled	(4,934)
Options exercised	0
Options forfeited and expired	(143,737)
Options Outstanding, ending balance	235,930	384,601
Vested and expected to vest	231,338
Exercisable	208,793