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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue:    
Total revenue $ 67,400 $ 38,380
Operating expenses:    
Research and development 16,004 10,013
Sales and marketing 15,452 11,723
General and administrative 15,223 10,003
Total operating expenses 68,258 44,131
Loss from operations (858) (5,751)
Other income (expense):    
Interest income, net 126 96
Change in estimated fair value of common stock warrant liability 27 (405)
Other expense, net (245) (63)
Total other expense (92) (372)
Loss before income taxes (950) (6,123)
Income tax benefit 263 300
Net loss $ (687) $ (5,823)
Net loss per share (Note 3):    
Basic (in dollars per share) $ (0.01) $ (0.14)
Diluted (in dollars per share) $ (0.01) $ (0.14)
Weighted-average shares used to compute net loss per share:    
Basic (in shares) 51,181,160 42,823,427
Diluted (in shares) 51,181,160 42,823,427
Testing services    
Revenue:    
Total revenue $ 59,281 $ 31,442
Operating expenses:    
Cost of goods and services 16,483 7,928
Product    
Revenue:    
Total revenue 5,778 4,695
Operating expenses:    
Cost of goods and services 3,647 3,199
Digital And Other    
Revenue:    
Total revenue 2,341 2,243
Operating expenses:    
Cost of goods and services $ 1,449 $ 1,265