SEGMENT REPORTING - Segment Activity (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues from external customers		$ 21,796		$ 23,257		$ 62,141		$ 67,058
Depreciation and amortization		705	[1]	710	[2]	2,132	[1]	2,147	[2]
Interest expense		137		119		374		364
Profit (loss) from operations		(2,019)		(585)		(7,679)		(3,945)
Segment assets		79,577		84,022		79,577		84,022		$ 79,843
Other intangibles assets, net		15,852		17,002		15,852		17,002		16,201
Goodwill		20,737		20,505		20,737		20,505		20,125
Expenditures for long-lived assets	[3]	271		354		1,083		1,125
Power and Electro Mechanical
Segment Reporting Information [Line Items]
Revenues from external customers		16,700		16,157		48,542		44,607
Depreciation and amortization		363	[1]	371	[2]	1,139	[1]	1,063	[2]
Interest expense		75		56		187		166
Profit (loss) from operations		890		813		1,984		1,038
Segment assets		49,377		51,438		49,377		51,438
Other intangibles assets, net		8,979		9,461		8,979		9,461
Goodwill		13,092		13,102		13,092		13,102
Expenditures for long-lived assets	[3]	157		99		786		580
Energy
Segment Reporting Information [Line Items]
Revenues from external customers		5,096		7,100		13,599		22,451
Depreciation and amortization		342	[1]	339	[2]	993	[1]	1,083	[2]
Interest expense		1		3		3		5
Profit (loss) from operations		(1,660)		(201)		(5,924)		(480)
Segment assets		29,495		32,316		29,495		32,316
Other intangibles assets, net		6,873		7,541		6,873		7,541
Goodwill		7,645		7,403		7,645		7,403		7,042
Expenditures for long-lived assets	[3]	114		255		297		545
Other
Segment Reporting Information [Line Items]
Revenues from external customers		0		0		0		0
Depreciation and amortization		0	[1]	0	[2]	0	[1]	1	[2]
Interest expense		61		60		184		193
Profit (loss) from operations		(1,249)		(1,197)		(3,739)		(4,503)
Segment assets		705		268		705		268
Other intangibles assets, net		0		0		0		0
Goodwill		0		0		0		0		$ 0
Expenditures for long-lived assets	[3]	$ 0		$ 0		$ 0		$ 0

[1] For the Power and Electromechanical segment, for the three and nine months ended September 30, 2017, depreciation and amortization include $184 thousand and $496 thousand, respectively, which were classified as cost of revenues in the Condensed Consolidated Statements of Operations.

[2] For the Power and Electromechanical segment, depreciation and amortization totals for the three and nine months ended September 30, 2016, include $125 thousand and $338 thousand, respectively, which were classified as cost of revenues in the Condensed Consolidated Statements of Operations.

[3] Includes purchases of property, plant and equipment and the investment in other intangible assets.