Annual report pursuant to Section 13 and 15(d)

Income taxes (Details) - Deferred tax assets and liabilities

v2.4.0.8
Income taxes (Details) - Deferred tax assets and liabilities (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Deferred tax assets:    
Federal tax carryforward losses $ 34,836 $ 29,531
Provision for uncollectible accounts receivable 920 1,263
State and local tax carry forward losses 3,791 2,914
Accrued royalties 143 143
Stock compensation 317 450
Depreciation 625 445
Research and development and other tax credit carryforwards 1,013 795
Foreign tax carryforward losses 772 108
Intangibles 2,980 2,903
Inventory 1,249 1,630
Accrued expenses 1,622 909
Other, net 19 15
Deferred tax assets 48,287 41,106
Deferred tax liabilities:    
Deferred patent costs (132) (139)
Prepaid expenses (695) (613)
Other, net (37) (31)
Deferred tax liabilities (864) (783)
Net deferred tax assets (liabilities) before valuation allowance 47,423 40,323
Less: valuation allowance (47,623) (41,261)
Net deferred tax liabilities $ (200) $ (938)