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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenue $ 265,166 $ 214,552 $ 147,277
Cost of revenue 70,277 52,485 38,795
Gross profit 194,889 162,067 108,482
Operating expenses:      
Research and development 41,329 37,299 20,860
Selling, general and administrative 197,233 179,523 133,313
Total operating expenses 238,562 216,822 154,173
Loss from operations (43,673) (54,755) (45,691)
Interest expense (1,519) (1,643) (3,115)
Other income, net 1,591 1,895 1,501
Loss on extinguishment of debt 0 0 (3,029)
Loss before income taxes (43,601) (54,503) (50,334)
Income tax provision 229 65 44
Net loss $ (43,830) $ (54,568) $ (50,378)
Net loss per common share, basic and diluted (in USD per share) $ (1.58) $ (2.16) $ (2.11)
Weighted-average shares, basic and diluted (in USD per share) 27,754,404 25,265,918 23,885,858