Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2019

Revenue From Contract With Customer [Abstract]

Disaggregated Revenue

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 June 30, 2019								Three Months Ended June 30, 2018
	Third-Party Software		Proprietary Software		Professional Engineering Service		Total		Third-Party Software		Proprietary Software		Professional Engineering Service		Total
Primary geographical markets:
North America	$	9,785	$	240	$	2,014	$	12,039	$	16,281	$	265	$	1,633	$	18,179
Europe		520		10		168		698		702		5		182		889
Asia		1,379		8		56		1,443		9		11		115		135
Total	$	11,684	$	258	$	2,238	$	14,180	$	16,992	$	281	$	1,930	$	19,203

	Six Months Ended June 30, 2019								Six Months Ended June 30, 2018
	Third-Party Software		Proprietary Software		Professional Engineering Service		Total		Third-Party Software		Proprietary Software		Professional Engineering Service		Total
Primary geographical markets:
North America	$	22,512	$	484	$	3,571	$	26,567	$	31,400	$	1,948	$	4,120	$	37,468
Europe		840		16		303		1,159		1,295		105		428		1,828
Asia		1,433		9		108		1,550		361		23		201		585
Total	$	24,785	$	509	$	3,982	$	29,276	$	33,056	$	2,076	$	4,749	$	39,881

Schedule of Significant Changes in Contract Assets and Deferred Revenue

Significant changes in the contract assets and the deferred revenue balances during the six months ended June 30, 2019 were as follows (in thousands):

	Six Months Ended June 30, 2019
	Contract Assets		Deferred Revenue
Revenue recognized that was included in deferred revenue at December 31, 2018	$	—	$	984
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 June 30, 2019:

	Remainder of 2019		2020		2021		2022
Third-party software	$	24	$	14	$	—	$	—
Proprietary software		1,375		2,036		2,107		274
Professional engineering services		—		—		—		—