Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017		Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 21,801	$ 15,409	[1]	$ 69,394	$ 48,876	[1]
Gross profit	5,421	4,224		16,659	13,363
Provision for income taxes	314	92		124	399
Net loss	(518)	$ (605)		(1,033)	(44)
Balance Sheet [Abstract]
Contract receivables, net	19,238			19,238
Deferred tax assets	6,203			6,203			$ 6,494
Billings in excess of revenue earned	7,810			7,810			14,543
Accumulated deficit	(43,248)			(43,248)			(42,870)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash (used in) provided by operating activities				(6,360)	2,997
Cash provided by (used in) financing activities				6,997	(1,090)
Effect of Change [Member]
Income Statement [Abstract]
Revenue	(151)			(272)
Gross profit	(151)			(272)
Provision for income taxes	(18)			77
Net loss	(169)			(195)
Balance Sheet [Abstract]
Contract receivables, net	0			0
Deferred tax assets	(164)			(164)
Billings in excess of revenue earned	(682)			(682)
Accumulated deficit	518			518			$ 655
Balance Without Adoption of ASC 606 [Member]
Income Statement [Abstract]
Revenue	21,952			69,666
Gross profit	5,572			16,931
Provision for income taxes	296			201
Net loss	(349)			(838)
Balance Sheet [Abstract]
Contract receivables, net	19,238			19,238
Deferred tax assets	6,367			6,367
Billings in excess of revenue earned	8,492			8,492
Accumulated deficit	$ (43,766)			$ (43,766)
ASU 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash (used in) provided by operating activities					(400)
Cash provided by (used in) financing activities					$ 400

[1] Prior period amounts have not been adjusted under the modified retrospective transition method for the adoption of ASC 606.