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Basis of Presentation (Tables)
 3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Revenue by Type
The following table summarizes revenue by type:
 (amounts in thousands)
 
Three Months Ended
March 31,
 
 
2017
 
2016
Revenue:
 
 

 
 

Usage revenue
 
$
15,859

 
$
14,296

Subscription revenue
 
6,897

 
6,364

Set-up and professional services
 
1,812

 
1,430

Total revenue
 
$
24,568

 
$
22,090