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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net revenue        
Total net revenue $ 1,168 $ 1,968 $ 2,506 $ 3,228
Cost of net revenue 444 604 939 1,134
Gross profit 724 1,364 1,567 2,094
Operating expenses        
Research and development 1,222 985 2,381 1,946
Selling, general and administrative 1,287 964 2,358 2,099
Total operating expenses 2,509 1,949 4,739 4,045
Loss from operations (1,785) (585) (3,172) (1,951)
Interest expense   (56) (30) (111)
Other income, net 580 2 628 18
Net loss (1,205) (639) (2,574) (2,044)
Deemed dividend for warrant exercise price adjustment   (392)   (392)
Net loss attributable to common stockholders $ (1,205) $ (1,031) $ (2,574) $ (2,436)
Net loss per share attributable to common stockholders        
Basic and diluted $ (0.18) $ (0.32) $ (0.44) $ (0.88)
Shares used in computing net loss per share        
Basic and diluted 6,857 3,265 5,865 2,780
Other comprehensive loss, net of tax:        
Net unrealized loss on available-for-sale securities $ (3)   $ (4)  
Comprehensive loss (1,208) $ (1,031) (2,578) $ (2,436)
Product        
Net revenue        
Total net revenue 1,017 1,679 2,195 2,747
Royalty and Other        
Net revenue        
Total net revenue $ 151 $ 289 $ 311 $ 481