Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended		1 Months Ended			6 Months Ended
	Dec. 17, 2013	Jun. 30, 2014	Dec. 31, 2013	Jan. 31, 2014 Warrant [Member]	Jun. 30, 2014 Preferred Stock [Member]	Jun. 30, 2014 Common Stock [Member]	Jun. 30, 2014 Redeemable Convertible Preferred Stock Series A-1 [Member]	Jun. 30, 2014 Redeemable Convertible Preferred Stock Series A-2 [Member]	Jun. 30, 2014 Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2013 Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2014 Series B Preferred Stock [Member]	Dec. 17, 2013 Series B Preferred Stock [Member]	Jun. 30, 2014 Maximum [Member]
Class of Stock [Line Items]
Debt conversion, converted instrument, shares issued		5,000,000
Common stock, par value		$ 0.0001	$ 0.0001				$ 0.007073	$ 1.202065			$ 1,000
Common Stock, Shares Authorized		100,000,000	100,000,000			100,000,000							110,000,000
Preferred Stock, Shares Authorized		10,000,000	10,000,000		10,000,000				10,000,000	10,000,000
Proceeds from Issuance of Convertible Preferred Stock							$ 3,308,874,000	$ 1,134,016,000	$ 4,950,000,000
Temporary Equity, Redemption Price Per Share							$ 0.55	$ 0.96
Temporary Equity, Liquidation Preference Per Share							$ 0.0100	$ 1.6996
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				238,412
Fair Value Adjustment of Warrants				348,963
Preferred Stock, Voting Rights									Holders of redeemable convertible preferred stock are entitled to one vote for each share of common stock into which their shares can be converted. Holders of Series A redeemable convertible preferred stock together are entitled to appoint one director of the Company.
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 2.66			$ 3.04
Class of Warrant or Right, Date from which Warrants or Rights Exercisable				Jan. 31, 2019
Sale of Stock, Price Per Share		$ 4.00
Warrants To Purchase Shares Of Common Stock	700,935
Preferred Stock, Shares Issued									0	6,176,748		2,750
Preferred Stock, Par or Stated Value Per Share		$ 0.001	$ 0.001						$ 0.0001	$ 0.0001		$ 1,000
Proceeds from Issuance of Private Placement	$ 2,750,000