REVENUE

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

The Company primarily derives its revenues through the sale or subscription licensing of its platform solutions and services. The following table disaggregates revenue by offering (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Platform solutions⁽¹⁾	$	151,454	$	130,523	$	421,695	$	347,698
Services⁽²⁾	14,999		15,286		47,226		43,664
Total revenue	$	166,453	$	145,809	$	468,921	$	391,362

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(1)	Platform solutions include arrangements for technology-based offerings representing subscription-based cloud-based platform offerings and legacy platform solutions that are not cloud-based and not billed under a subscription-based contract structure.


(2)	Services include advisory, implementation, and support services under time and materials, fixed price, or retainer-based contracts.

Contract Balances

The Company had an unbilled receivables balance of $24.5 million and $20.5 million as of September 30, 2019 and December 31, 2018, respectively. Unbilled receivables are classified as accounts receivable on the consolidated balance sheet. The Company had deferred commissions of $11.9 million and $5.7 million as of September 30, 2019 and December 31, 2018, respectively.

The Company had a deferred revenue balance of $18.0 million and $20.6 million as of September 30, 2019 and December 31, 2018, respectively. Revenue recognized during the three and nine months ended September 30, 2019 that was included in the deferred revenue balance at the beginning of the year was $3.7 million and $16.8 million, respectively.