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Exercise Price for Options Outstanding and Options Exercisable (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
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3 Months Ended |
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Jun. 30, 2012
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Exercise Price Range 1
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| Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |
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| 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 |
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Exercise Price Range 2
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| Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |
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| 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 |
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Exercise Price Range 3
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| Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |
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| 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 |
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Exercise Price Range 4
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| Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |
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| 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 |