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Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Data [Abstract]
Total revenue	$ 25,129us-gaap_SalesRevenueNet	$ 21,250us-gaap_SalesRevenueNet	$ 12,455us-gaap_SalesRevenueNet	$ 11,696us-gaap_SalesRevenueNet	$ 16,287us-gaap_SalesRevenueNet	$ 20,563us-gaap_SalesRevenueNet	$ 24,181us-gaap_SalesRevenueNet	$ 23,086us-gaap_SalesRevenueNet	$ 70,530us-gaap_SalesRevenueNet	$ 84,117us-gaap_SalesRevenueNet	$ 87,419us-gaap_SalesRevenueNet
Operating loss	(5,715)us-gaap_OperatingIncomeLoss	(7,735)us-gaap_OperatingIncomeLoss	(26,400)us-gaap_OperatingIncomeLoss	(12,667)us-gaap_OperatingIncomeLoss	(14,876)us-gaap_OperatingIncomeLoss	(6,675)us-gaap_OperatingIncomeLoss	(11,028)us-gaap_OperatingIncomeLoss	(8,850)us-gaap_OperatingIncomeLoss	(52,517)us-gaap_OperatingIncomeLoss	(41,429)us-gaap_OperatingIncomeLoss	(57,741)us-gaap_OperatingIncomeLoss
Net loss	$ (3,363)us-gaap_NetIncomeLoss	$ (6,353)us-gaap_NetIncomeLoss	$ (25,423)us-gaap_NetIncomeLoss	$ (13,517)us-gaap_NetIncomeLoss	$ (22,705)us-gaap_NetIncomeLoss	$ (8,417)us-gaap_NetIncomeLoss	$ (14,623)us-gaap_NetIncomeLoss	$ (10,513)us-gaap_NetIncomeLoss	$ (48,656)us-gaap_NetIncomeLoss	$ (56,258)us-gaap_NetIncomeLoss	$ (66,131)us-gaap_NetIncomeLoss
Net loss per common share—basic	$ (0.36)us-gaap_EarningsPerShareBasic	$ (0.72)us-gaap_EarningsPerShareBasic	$ (3.12)us-gaap_EarningsPerShareBasic	$ (1.74)us-gaap_EarningsPerShareBasic	$ (3.30)us-gaap_EarningsPerShareBasic	$ (1.35)us-gaap_EarningsPerShareBasic	$ (2.39)us-gaap_EarningsPerShareBasic	$ (1.80)us-gaap_EarningsPerShareBasic	$ (5.74)us-gaap_EarningsPerShareBasic	$ (8.98)us-gaap_EarningsPerShareBasic	$ (12.46)us-gaap_EarningsPerShareBasic
Net loss per common share—diluted	$ (0.36)us-gaap_EarningsPerShareDiluted	$ (0.72)us-gaap_EarningsPerShareDiluted	$ (3.12)us-gaap_EarningsPerShareDiluted	$ (1.74)us-gaap_EarningsPerShareDiluted	$ (3.30)us-gaap_EarningsPerShareDiluted	$ (1.35)us-gaap_EarningsPerShareDiluted	$ (2.39)us-gaap_EarningsPerShareDiluted	$ (1.80)us-gaap_EarningsPerShareDiluted	$ (5.74)us-gaap_EarningsPerShareDiluted	$ (8.98)us-gaap_EarningsPerShareDiluted	$ (12.46)us-gaap_EarningsPerShareDiluted

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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