Computation of Basic and Diluted Net Loss Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Numerator:
Loss from continuing operations	$ (12,240)	[1]	$ (11,778)
Income from discontinued operations, net of tax		[1]	170
Net loss	$ (12,240)	[1],[2],[3]	$ (11,608)
Denominator:
Weighted average shares used to compute basic and diluted net income (loss) per share:	30,574,032	[1]	24,870,684
Basic and diluted net income (loss) per share:
Continuing operations	$ (0.40)	[1]	$ (0.47)
Discontinued operations		[1]	$ 0.01
Net loss	$ (0.40)	[1]	$ (0.46)

[1] Restated and Revised, see Note 2

[2] Restated and Revised, see Note 2

[3] Restated and Revised, see Note 2