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Business and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of revenue
The following table presents a summary of revenue:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in thousands)
2019
 
2018
 
2019
 
2018
Subscription revenue
$
69,370

 
$
48,725

 
$
134,107

 
$
93,057

Perpetual license and maintenance revenue
13,553

 
13,412

 
27,080

 
26,889

Professional services and other revenue
2,461

 
1,455

 
4,498

 
2,753

Revenue
$
85,384

 
$
63,592

 
$
165,685

 
$
122,699
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 June 30,
 
Six Months Ended June 30,
(in thousands)
2019
 
2018
 
2019
 
2018
Beginning balance
$
59,811

 
$
50,451

 
$
59,434

 
$
50,176

Capitalization of contract acquisition costs
8,608

 
4,700

 
15,234

 
9,847

Amortization of deferred contract acquisition costs
(6,553
)
 
(4,346
)
 
(12,802
)
 
(9,218
)
Ending balance
$
61,866

 
$
50,805

 
$
61,866

 
$
50,805