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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenues
The following table summarizes revenue by the Company’s service offerings (in thousands):
Year Ended December 31,
202120202019
Subscription services$360,506 $242,879 $168,682 
Professional services10,516 6,780 3,695 
Total revenue$371,022 $249,659 $172,377 
Deferred Revenue and Remaining Performance Obligations
Deferred revenue consists of customer billings in advance of revenue being recognized from the Company’s subscription and professional services arrangements. The following table summarizes the changes in the balance of deferred revenue during the periods (in thousands):
December 31,
202120202019
Balance at beginning of the year$104,184 $67,540 $39,739 
Add: Billings during the year427,011 286,303 200,178 
Less: Revenue recognized during the year(371,022)(249,659)(172,377)
Balance at end of the year$160,173 $104,184 $67,540 
Deferred Contract Acquisition Costs
The change in the balance of deferred contract acquisition costs during the periods presented is as follows (in thousands):
December 31,
202120202019
Balance at beginning of the year$18,273 $11,610 $6,069 
Add: Contract costs capitalized during the year24,218 14,344 9,579 
Less: Amortization of contract costs during the year(12,844)(7,681)(4,038)
Balance at end of the year$29,647 $18,273 $11,610