Deferred Commissions
3 Months Ended
Apr. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract]  
Deferred Commissions
Revenue from Contracts with Customers
During the three months ended April 30, 2019 and 2018, the Company recognized $39.4 million and $23.9 million of subscription revenue, respectively, and $1.8 million and $0.9 million of professional services revenue, respectively, which were included in the deferred revenue balance as of January 31, 2019 and 2018, respectively.
As of April 30, 2019, including amounts already invoiced and amounts contracted but not yet invoiced, approximately $113.7 million of revenue was expected to be recognized from remaining performance obligations, of which $111.2 million related to subscription services and $2.5 million related to professional services. Approximately 98% of revenue related to remaining performance obligations is expected to be recognized in the next 12 months.
Deferred Commissions
Deferred commissions were $31.8 million as of April 30, 2019 and $29.0 million as of January 31, 2019.
Amortization expense for deferred commissions was $3.9 million and $2.0 million for the three months ended April 30, 2019 and 2018, respectively. Deferred commissions are amortized over a period of three years and the amortization expense is recorded in sales and marketing on the Company’s condensed consolidated statements of operations.