Revenue Recognition (Tables)

9 Months Ended

Sep. 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 September 30, 2018								Three Months Ended September 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	$	13,715	$	288	$	1,438	$	15,441	$	15,615	$	532	$	1,835	$	17,982
Europe		526		2		146		674		520		—		276		796
Asia		—		506		73		579		105		668		102		875
Total	$	14,241	$	796	$	1,657	$	16,694	$	16,240	$	1,200	$	2,213	$	19,653

	Nine Months Ended September 30, 2018								Nine Months Ended September 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	$	45,115	$	2,236	$	5,558	$	52,909	$	46,867	$	3,650	$	6,963	$	57,480
Europe		1,821		107		574		2,502		1,380		—		1,053		2,433
Asia		361		529		274		1,164		295		685		449		1,429
Total	$	47,297	$	2,872	$	6,406	$	56,575	$	48,542	$	4,335	$	8,465	$	61,342

Schedule of Significant Changes in Contract Assets and Deferred Revenue

Significant changes in the contract assets and the deferred revenue balances during the nine months ended September 30, 2018 were as follows (in thousands):

	Nine Months Ended September 30, 2018
	Contract Assets		Deferred Revenue
Revenue recognized that was included in deferred revenue at December 31, 2017	$	—	$	2,847
Transferred to receivables from contract assets recognized at December 31, 2017		263		—

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 September 30, 2018:

	Remainder of 2018		2019		2020		2021
Third-party software	$	24	$	50	$	14	$	—
Proprietary software		853		1,827		1,802		687
Professional engineering service		230		—		—		—