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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]        
Revenue $ 205 $ 7 $ 206 $ 40
Cost of revenue 196 0 196 11
Gross profit 9 7 10 29
Operating expenses:        
Selling, general and administrative 1,110 1,286 2,312 2,430
Research and development 939 897 1,794 2,000
Total operating expenses 2,049 2,183 4,106 4,430
Loss from operations (2,040) (2,176) (4,096) (4,401)
Interest and other income (expense), net (43) 16 (55) 3
Loss from operations before income taxes (2,083) (2,160) (4,151) (4,398)
Income tax benefit 0 0 0 0
Net loss $ (2,083) $ (2,160) $ (4,151) $ (4,398)
Weighted average common shares outstanding:        
Basic and diluted 5,947 4,678 5,769 4,374
Basic and diluted net loss per common share:        
Net loss $ (0.35) $ (0.46) $ (0.72) $ (1.01)
Other comprehensive loss, net of tax:        
Net loss $ (2,083) $ (2,160) $ (4,151) $ (4,398)
Available-for-sale securities:        
Reclassification adjustment for realized loss 0 0 0 31
Total comprehensive loss $ (2,083) $ (2,160) $ (4,151) $ (4,367)