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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue:        
Total revenue $ 39,861 $ 26,496 $ 93,536 $ 84,803
Costs and expenses:        
Research and development 8,128 7,125 25,275 23,362
Selling, general and administrative 22,655 20,729 65,966 65,687
Total costs and expenses 45,325 40,312 127,668 127,461
Loss from operations (5,464) (13,816) (34,132) (42,658)
Interest expense (885) (444) (2,682) (3,636)
Loss from extinguishment of debt 0 0 0 (9,000)
Other income (expense), net 107 205 (248) 920
Loss before income taxes (6,242) (14,055) (37,062) (54,374)
Income tax benefit 243 1,168 2,068 2,269
Net loss $ (5,999) $ (12,887) $ (34,994) $ (52,105)
Net loss per share, basic and diluted (usd per share) $ (0.08) $ (0.19) $ (0.49) $ (0.79)
Shares used in computing net loss per share, basic and diluted (shares) 72,486 69,469 71,294 65,792
Product revenue        
Revenue:        
Total revenue $ 29,210 $ 20,666 $ 65,596 $ 68,728
Costs and expenses:        
Cost of revenue 12,773 10,520 31,896 33,009
Service revenue        
Revenue:        
Total revenue 6,131 5,630 16,457 15,875
Costs and expenses:        
Cost of revenue 1,769 1,938 4,531 5,403
Development revenue        
Revenue:        
Total revenue 3,180 0 6,180 0
Other revenue        
Revenue:        
Total revenue $ 1,340 $ 200 $ 5,303 $ 200