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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net revenue        
Total net revenue $ 1,337 $ 1,971 $ 3,843 $ 5,199
Cost of net revenue 376 677 1,315 1,811
Gross profit 961 1,294 2,528 3,388
Operating expenses        
Research and development 1,281 972 3,662 2,918
Selling, general and administrative 1,398 955 3,756 3,054
Total operating expenses 2,679 1,927 7,418 5,972
Loss from operations (1,718) (633) (4,890) (2,584)
Interest expense   (70) (30) (181)
Other income (expense), net 4 (4) 632 14
Net loss (1,714) (707) (4,288) (2,751)
Deemed dividend for warrant exercise price adjustment       (392)
Net loss attributable to common stockholders (1,714) (707) (4,288) (3,143)
Other comprehensive loss, net of tax:        
Net unrealized loss on available-for-sale securities (2)   (6)  
Comprehensive loss $ (1,716) $ (707) $ (4,294) $ (2,751)
Net loss per share attributable to common stockholders        
Basic and diluted $ (0.20) $ (0.20) $ (0.63) $ (1.03)
Shares used in computing net loss per share        
Basic and diluted 8,676 3,546 6,812 3,037
Product        
Net revenue        
Total net revenue $ 1,210 $ 1,803 $ 3,405 $ 4,550
Royalty and Other        
Net revenue        
Total net revenue $ 127 $ 168 $ 438 $ 649