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Stockholders' Equity (Detail) - Schedule of share-based compensation expense by line item (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Apr. 30, 2013
|
Apr. 30, 2012
|
Apr. 30, 2013
|
Apr. 30, 2012
|
|
| Share Based Payment Arrangement | $ 140 | $ 168 | $ 441 | $ 595 |
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Cost of Clinical Laboratory Services [Member]
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| Share Based Payment Arrangement | 2 | 3 | 7 | 8 |
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Research and Development Expense [Member]
|
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| Share Based Payment Arrangement | 1 | 1 | 2 | 4 |
|
Selling, General and Administrative Expenses [Member]
|
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| Share Based Payment Arrangement | $ 137 | $ 164 | $ 432 | $ 583 |