Securities Excluded from Calculation of Diluted Net Earnings (Loss) Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents	11	28,168	27	28,168
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents		21,444		21,444
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents		36		36
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents	11	6,688	27	6,688