Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Summary of Restricted Stock Unit and Restricted Stock Award Activity (Detail)

v2.4.0.6
Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Summary of Restricted Stock Unit and Restricted Stock Award Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Nonvested Restricted Stock Units Activity [Line Items]  
Number of Shares, Granted 1,000
Restricted Stock Units And Restricted Stock Awards [Member]
 
Nonvested Restricted Stock Units Activity [Line Items]  
Number of Shares, Outstanding, Beginning Balance 1,820
Number of Shares, Granted 3,553
Number of Shares, Vested (629)
Number of Shares, Canceled (433)
Number of Shares, Outstanding, Ending Balance 4,311
Weighted-Average Grant Date Fair Value per Share, Outstanding, Beginning Balance 7.87
Weighted-Average Grant Date Fair Value per Share, Granted 5.83
Weighted-Average Grant Date Fair Value per Share, Vested 7.20
Weighted-Average Grant Date Fair Value per Share, Canceled 7.38
Weighted-Average Grant Date Fair Value per Share, Outstanding, Ending Balance 6.33