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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data
The following information has been derived from unaudited consolidated financial statements that, in the opinion of management, include all recurring adjustments necessary for a fair statement of such information (in thousands except per share data):
 
    
Three Months Ended
  
   
Dec 31,
2020
    
Sep 30,
2020
    
Jun 30,
2020
    
Mar 31,
2020
    
Dec 31,
2019
    
Sep 30,
2019
    
Jun 30,
2019
    
Mar 31,
2019
  
Statements of Operations Data:
                                                                 
Revenue
    $   97,292     $   89,977     $ 78,302     $   81,364     $   73,799     $   67,112     $   55,667     $   52,233  
Cost of revenue
      5,683       5,378       4,977       5,335       4,681       4,052       3,504       3,666  
Loss from operations
      (3,784 )      (3,289 )      (2,956 )      (1,653 )      (1,155 )      (82 )      (2,246 )      (4,566 ) 
Net income (loss)
      (3,768 )      (3,184 )      (2,808 )      (1,442 )      (934 )      173       (1,974 )      (4,382 ) 
Basic and diluted net income (loss) per share available (attributable) to common stockholders:
    $ (0.13 )    $ (0.12 )    $ (0.10 )    $ (0.05 )    $ (0.04 )    $ 0.01     $ (0.08 )    $ (0.17 )