Financing - Additional Information 3 (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended
	May 07, 2013	May 07, 2013
Equity [Abstract]
Net proceeds from sale of common stock and warrants excluding the proceeds from future exercise of the warrants, if any	$ 14.5
Redemption price per share of warrants	0.01
Notice period to holder prior to redemption of warrants by Company	30 days
Minimum trading days considered to redeem warrants	20 days
Maximum trading days considered to redeem warrants	30 days
Minimum closing price to redeem the warrants		2.80