Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		0 Months Ended		3 Months Ended
	Jan. 17, 2014	Mar. 31, 2014	Dec. 31, 2013	Jan. 17, 2014 Underwriters' Overallotment Option [Member]	Jan. 31, 2014 Performance Units [Member]	Mar. 31, 2014 Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, conversion basis						9,836
Common stock, conversion basis						16,387
Preferred stock dividends, shares						1,014
Dividends in arrears						$ 9
Common stock issued, shares		55,211,327	48,216,480		33,594
Shares of common stock issued in public offering	6,325,000			825,000
Public offering price per share	$ 6.15
Net proceeds received from shares issuances	$ 36,607	$ 36,607
Common stock, capital shares reserved for future issuance		7,998,089