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Business and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of revenue The following table presents a summary of revenue:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in thousands)
2018
 
2017
 
2018
 
2017
Subscription revenue
$
53,511

 
$
34,932

 
$
146,568

 
$
93,478

Perpetual license and maintenance revenue
13,864

 
12,857

 
40,753

 
37,129

Professional services and other revenue
2,065

 
1,191

 
4,818

 
3,003

Revenue
$
69,440

 
$
48,980

 
$
192,139

 
$
133,610
Activity of deferred contract costs The following summarizes the activity of deferred incremental costs of obtaining a contract in the periods presented:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in thousands)
2018
 
2017
 
2018
 
2017
Beginning balance
$
50,805

 
$
36,252

 
$
50,176

 
$
30,118

Capitalization of contract acquisition costs
7,138

 
9,032

 
16,985

 
21,194

Amortization of deferred contract acquisition costs
(5,059
)
 
(3,891
)
 
(14,277
)
 
(9,919
)
Ending balance
$
52,884

 
$
41,393

 
$
52,884

 
$
41,393