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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
NET REVENUE        
Total net revenue $ 10,297 $ 7,573 $ 19,493 $ 14,450
COSTS OF REVENUE AND OPERATING EXPENSES        
Costs of revenue - rental, product & supply 1,948 1,330 3,732 2,566
Sales and marketing 3,081 1,457 5,554 2,763
General and administrative 2,684 2,071 5,367 4,450
Total costs of revenue and operating expenses 7,713 4,858 14,653 9,779
Income from operations 2,584 2,715 4,840 4,671
Other income (expense)        
Deferred insurance reimbursement 0 0 880 0
Interest expense 0 (37) 0 (153)
Other income (expense), net 0 (37) 880 (153)
Income from operations before income taxes 2,584 2,678 5,720 4,518
Income tax expense 422 260 1,208 179
Net income $ 2,162 $ 2,418 $ 4,512 $ 4,339
Net income per share.:        
Basic $ 0.07 $ 0.07 $ 0.14 $ 0.13
Diluted $ 0.06 $ 0.07 $ 0.13 $ 0.13
Weighted average basic shares outstanding 32,326 32,620 32,279 32,610
Weighted average diluted shares outstanding 33,953 34,169 33,837 34,291
Devices [Member]        
NET REVENUE        
Total net revenue $ 2,288 $ 1,673 $ 4,263 $ 3,261
Supplies [Member]        
NET REVENUE        
Total net revenue $ 8,009 $ 5,900 $ 15,230 $ 11,189