Preferred Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Aug. 31, 2013	Dec. 31, 2013	Mar. 31, 2014
Class of Stock [Line Items]
Preferred stock, shares outstanding		0	0
Preferred stock, cumulative dividend rate (in percent)	7.50%
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred Stock Conversion Rate	14.1844	14.1844
Stock Redeemed or Called During Period, Shares		300
Payments for repurchase of convertible preferred stock		$ 30
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Conversion of Stock, Shares Converted	233,843	183,496
Common Stock
Class of Stock [Line Items]
Common stock issued from preferred stock conversion (in shares)	3,316,922	2,602,770
Preferred Stock Conversions, Inducements, Shares	75,342