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Income Taxes (Details 3) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Deferred tax assets:    
Net operating loss and credit carryforwards $ 16,044,000 $ 16,282,000
Stock-based compensation 822,000 710,000
R&D and other credits 2,014,000 1,899,000
Capitalized R&D expenses 476,000 373,000
Inventory 156,000 143,000
Accrued expenses and other 111,000 83,000
Gross deferred tax assets 19,623,000 19,490,000
Valuation allowance for deferred tax assets (16,725,000) (16,123,000)
Total deferred tax assets 2,898,000 3,367,000
Deferred tax liabilities:    
Depreciation and other (277,000) (563,000)
Intangible assets (1,969,000) (2,180,000)
Total deferred tax liabilities (2,246,000) (2,743,000)
Net deferred tax asset $ 652,000 $ 624,000