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) (2007 Employee, Director and Consultant Stock Plan equity compensation plan, USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Weighted Average Remaining Contractual Life (Years) 4 years 3 months 22 days
Number Outstanding and exercisable at end of period 4,798
Weighted Average Exercise Price $ 1.80
Aggregate Intrinsic Value $ 807,598
Exercise Price Range 1
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, lower limit $ 0.00
Range of Exercise Price, upper limit $ 1
Weighted Average Remaining Contractual Life (Years) 3 years 6 months 4 days
Number Outstanding and exercisable at end of period 2,698
Weighted Average Exercise Price $ 0.47
Aggregate Intrinsic Value $ 807,598
Exercise Price Range 2
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, lower limit $ 2.00
Range of Exercise Price, upper limit $ 3
Weighted Average Remaining Contractual Life (Years) 5 years 5 months 19 days
Number Outstanding and exercisable at end of period 1,300
Weighted Average Exercise Price $ 2.75
Exercise Price Range 3
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, lower limit $ 4.00
Range of Exercise Price, upper limit $ 5
Weighted Average Remaining Contractual Life (Years) 5 years 1 month 13 days
Number Outstanding and exercisable at end of period 800
Weighted Average Exercise Price $ 4.75