Options Activity Under Option Plan (Detail) (USD $)	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balances, December 31, 2012, Stock Options Issued and Outstanding		10,255,222
Options Granted, Stock Options Issued and Outstanding	3,811,236	3,176,750	3,583,419
Options Exercised, Stock Options Issued and Outstanding		(2,232,969)
Options Forfeited/Expired, Stock Options Issued and Outstanding		(370,321)
Balances, December 31, 2013, Stock Options Issued and Outstanding	10,255,222	10,828,682
Balances, December 31, 2012, Weighted Average Exercise Price		$ 1.19
Options Granted, Weighted Average Exercise Price		$ 9.75
Options Exercised, Weighted Average Exercise Price		$ 0.77
Options Forfeited/Expired, Weighted Average Exercise Price		$ 1.90
Balances, December 31, 2013, Weighted Average Exercise Price	$ 1.19	$ 3.76