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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net revenue    
Total net revenue $ 1,338 $ 1,260
Cost of net revenue 495 530
Gross profit 843 730
Operating expenses    
Research and development 1,159 961
Selling, general and administrative 1,071 1,135
Total operating expenses 2,230 2,096
Loss from operations (1,387) (1,366)
Interest expense (30) (55)
Other income, net 48 16
Net loss (1,369) (1,405)
Other comprehensive loss, net of tax:    
Net unrealized loss on available-for-sale securities (1)  
Comprehensive loss $ (1,370) $ (1,405)
Net loss per share    
Basic and diluted $ (0.28) $ (0.61)
Shares used in computing net loss per share    
Basic and diluted 4,862 2,295
Product    
Net revenue    
Total net revenue $ 1,178 $ 1,068
Royalty and Other    
Net revenue    
Total net revenue $ 160 $ 192