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Deferred Revenue and Performance Obligations
 12 Months Ended
Jan. 31, 2020
Revenue from Contract with Customer [Abstract]  
Deferred Revenue and Performance Obligations Deferred Revenue and Performance Obligations
The following table presents the changes to the Company’s deferred revenue:
 
Year Ended January 31,
 
2020
 
2019
 
2018
 
(in thousands)
Deferred revenue, beginning of period
$
64,104

 
$
38,169

 
$
22,973

Billings
194,816

 
143,758

 
94,826

Revenue recognized
(166,351
)
 
(117,823
)
 
(79,630
)
Deferred revenue, end of period
$
92,569

 
$
64,104

 
$
38,169


Approximately 38%, 32%, and 27% of total revenue recognized in the fiscal years ended January 31, 2020, 2019, and 2018 was from the deferred revenue balance as of January 31, 2019, 2018 and 2017, respectively.
As of January 31, 2020 and January 31, 2019, future estimated revenue related to performance obligations for subscriptions with terms of more than one year that are unsatisfied or partially unsatisfied at the end of the reporting periods was approximately $75.7 million and $43.6 million, respectively. The Company expects to satisfy the substantial majority of these unsatisfied performance obligations over the next 24 months and the remainder thereafter. The Company applied the optional exemption for subscriptions with terms of less than a one year.