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Quarterly Financial Information (unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (unaudited) Quarterly Financial Information (unaudited)
The following table provides selected unaudited quarterly financial data for the years ended December 31, 2019 and 2018 (in thousands, except per share data):
Three Months Ended
December 31, 2019September 30, 2019June 30, 2019March 31, 2019
Revenue$18,634  $17,026  $14,928  $12,766  
Gross profit$13,913  $12,856  $11,231  $9,427  
Net loss$(8,291) $(8,007) $(11,959) $(24,158) 
Net loss per share, basic and diluted$(0.27) $(0.26) $(0.42) $(20.12) 

Three Months Ended
December 31, 2018September 30, 2018June 30, 2018March 31, 2018
Revenue$11,470  $9,614  $7,767  $5,706  
Gross profit$7,803  $6,732  $5,376  $3,772  
Net loss$(15,618) $(8,953) $(7,651) $(5,408) 
Net loss per share, basic and diluted$(14.12) $(8.49) $(8.16) $(7.31)