Computation of Diluted Net Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	165 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Basic and diluted net loss per common share:
Net loss applicable to common stockholders	$ (5,408)	$ (3,472)	$ (107,629)
Weighted average common shares outstanding - basic and diluted	20,270	16,079
Net loss per common share - basic and diluted	$ (0.27)	$ (0.22)

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

No definition available.

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration