Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

The following table provides information about disaggregated revenue by primary geographical market and includes a reconciliation of the disaggregated revenue with reportable segments (in thousands):

	Three Months Ended March 31, 2019								Three Months Ended March 31, 2018
	Third-Party Software		Proprietary Software		Professional Engineering Service		Total		Third-Party Software		Proprietary Software		Professional Engineering Service		Total
Primary geographical markets:
North America	$	12,727	$	244	$	1,557	$	14,528	$	15,119	$	1,683	$	2,487	$	19,289
Europe		320		6		135		461		593		100		246		939
Asia		54		1		52		107		352		12		86		450
Total	$	13,101	$	251	$	1,744	$	15,096	$	16,064	$	1,795	$	2,819	$	20,678

Schedule of Significant Changes in Contract Assets and Deferred Revenue

Significant changes in the contract assets and the deferred revenue balances during the three months ended March 31, 2019 were as follows (in thousands):

	Three Months Ended March 31, 2019
	Contract Assets		Deferred Revenue
Revenue recognized that was included in deferred revenue at December 31, 2018	$	—	$	369
Transferred to receivables from contract assets recognized at December 31, 2018		302		—

Estimated Revenue Expected to be Recognized in Future Related to Performance Obligations

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period (in thousands). The estimated revenue does not include contracts with original durations of one year or less, amounts of variable consideration attributable to royalties, or contract renewals that are unexercised as of March 31, 2019:

	Remainder of 2019		2020		2021		2022
Third-party software	$	37	$	14	$	—	$	—
Proprietary software		2,179		1,755		1,936		196
Professional engineering services		—		—		—		—