Convertible Notes - Additional Information (Detail) (USD $)	0 Months Ended			3 Months Ended		6 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Mar. 28, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Mar. 28, 2013
Debt Instrument [Line Items]
Convertible notes, maturity date						Mar. 28, 2016
Convertible notes agreed to extend original principal amount									$ 300,000
Gain on extinguishment of convertible notes			8,900,000				8,898,000
Convertible Notes agreed to extend the original maturity date			2 years
Aggregate fair value of the convertible notes				129,000,000		129,000,000		91,900,000
Convertible notes conversion, common stock						11,727,430
Convertible Notes and accrued interest conversion percentage				62.50%		62.50%
Initial public offering price				$ 11.00		$ 11.00
Weighted average implied discount rates	40.00%	40.00%
Convertible Notes in interest expense				(34,027,000)	(15,620,000)	(50,178,000)	(12,255,000)
Convertible Notes [Member]
Debt Instrument [Line Items]
Gain on extinguishment of convertible notes							(8,898,000)
Convertible Notes in interest expense						37,100,000	3,200,000
Investor Notes [Member]
Debt Instrument [Line Items]
Subordinated convertible notes, issuance percentage						8.00%
Convertible notes, maturity date description						Investor Notes had original maturity dates of June 1, 2014, June 14, 2014 and December 6, 2014, depending on their date of issuance.
Investor Notes [Member] | June Two Thousand Eleven Through January Two Thousand Thirteen [Member]
Debt Instrument [Line Items]
Subordinated convertible notes, issued				69,900,000		69,900,000
Investor Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Gain on extinguishment of convertible notes							(8,498,000)
Arcapita Notes [Member]
Debt Instrument [Line Items]
Noninterest bearing convertible notes, issued				3,500,000		3,500,000
Convertible notes, maturity date						Dec. 06, 2014
Arcapita Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Gain on extinguishment of convertible notes							$ (400,000)