Quarterly report pursuant to sections 13 or 15(d)

Exercise Price for Options Outstanding and Options Exercisable (Detail)

v2.4.0.6
Exercise Price for Options Outstanding and Options Exercisable (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Exercise Price Range 1
  
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]  
Range of Exercise Price, lower limit $ 0.00
Range of Exercise Price, upper limit $ 1.00
Weighted Average Remaining Contractual Life (Years) 4 years 7 days
Number Outstanding at end of period 2,698
Weighted Average Exercise Price $ 0.47
Aggregate Intrinsic Value $ 807,598
Exercise Price Range 2
  
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]  
Range of Exercise Price, lower limit $ 2.00
Range of Exercise Price, upper limit $ 3.00
Weighted Average Remaining Contractual Life (Years) 5 years 11 months 19 days
Number Outstanding at end of period 1,300
Weighted Average Exercise Price $ 2.75
Exercise Price Range 3
  
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]  
Range of Exercise Price, lower limit $ 4.00
Range of Exercise Price, upper limit $ 5.00
Weighted Average Remaining Contractual Life (Years) 5 years 7 months 13 days
Number Outstanding at end of period 800
Weighted Average Exercise Price $ 4.75
Exercise Price Range 4
  
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]  
Weighted Average Remaining Contractual Life (Years) 4 years 9 months 22 days
Number Outstanding at end of period 4,798
Weighted Average Exercise Price $ 1.80
Aggregate Intrinsic Value $ 807,598