Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table presents revenue disaggregated by revenue source and pattern of revenue recognition (in thousands):

	Three Months Ended March 31,
	2021						2020
	Over Time		Point In Time		Total Revenues		Over Time		Point In Time		Total Revenues
Time and materials contracts	$	128,591	$	—	$	128,591	$	99,991	$	—	$	99,991
Fixed fee percent complete contracts	11,580		—		11,580		11,621		—		11,621
Fixed fee contracts	22,477		—		22,477		25,028		—		25,028
Reimbursable expenses	2,254		—		2,254		4,394		—		4,394
Total professional services fees	164,902		—		164,902		141,034		—		141,034
Other services revenue*	3,117		711		3,828		3,630		738		4,368
Total services	168,019		711		168,730		144,664		738		145,402
Software and hardware	—		611		611		—		160		160
Total revenues	$	168,019	$	1,322	$	169,341	$	144,664	$	898	$	145,562

* Other services revenue primarily consists of hosting fees, maintenance, training, internally developed SaaS revenue and partner referral fees.

The following table presents revenue disaggregated by geographic area, as determined by the billing address of customers (in thousands):

	Three Months Ended March 31,
	2021		2020
United States	$	165,808	$	142,570
Other countries	3,533		2,992
Total revenues	$	169,341	$	145,562