Fair Value of Financial Instruments - Additional Information (Detail) (Convertible Senior Subordinated Notes, USD $)	1 Months Ended
	Jan. 24, 2013	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Conversion rate of convertible note into shares of common stock	121.1240
Principal amount of convertible notes, denominator	$ 1,000	$ 1,000
Conversion price of per share	$ 8.26
Early Conversion Payment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Conversion Of Stock Conversion Price	$ 83.33
Principal amount of convertible notes, denominator	$ 1,000