Revenue Recognition(Tables)

6 Months Ended

Jun. 30, 2018

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, 2018								Three Months Ended June 30, 2017
	Third-Party Software		Proprietary Software		Professional Engineering Service		Total		Third-Party Software		Proprietary Software		Professional Engineering Service		Total
Primary geographical markets:
North America	$	16,281	$	265	$	1,633	$	18,179	$	14,956	$	473	$	2,299	$	17,728
Europe		702		5		182		889		435		—		379		814
Asia		9		11		115		135		114		8		184		306
Total	$	16,992	$	281	$	1,930	$	19,203	$	15,505	$	481	$	2,862	$	18,848

	Six Months Ended June 30, 2018								Six Months Ended June 30, 2017
	Third-Party Software		Proprietary Software		Professional Engineering Service		Total		Third-Party Software		Proprietary Software		Professional Engineering Service		Total
Primary geographical markets:
North America	$	31,400	$	1,948	$	4,120	$	37,468	$	31,252	$	3,118	$	5,128	$	39,498
Europe		1,295		105		428		1,828		859		—		777		1,636
Asia		361		23		201		585		191		17		347		555
Total	$	33,056	$	2,076	$	4,749	$	39,881	$	32,302	$	3,135	$	6,252	$	41,689

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, 2018 were as follows (in thousands):

	Six Months Ended June 30, 2018
	Contract Assets		Deferred Revenue
Revenue recognized that was included in deferred revenue at December 31, 2017	$	—	$	2,681
Transferred to receivables from contract assets recognized at December 31, 2017		238		—

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, 2018:

	Remainder of 2018		2019		2020		2021
Third-party software	$	55	$	50	$	14	$	—
Proprietary software		1,028		1,699		1,615		445
Professional engineering services		230		—		—		—