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SEGMENT REPORTING Reconciliation of Segment Income (Loss) to Consolidated Net Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Total consolidated revenues for reportable segments                 $ 17,857 $ 17,539 $ 12,966
Other operational segment revenues                 1,562 1,389 1,278
Total consolidated revenues (4,796) (4,713) (5,727) (4,183) (6,675) (5,051) (4,107) (3,095) (19,419) (18,928) (14,244)
Net income (loss) before income taxes for reportable segments                 (14,029) (4,467) (2,555)
Other operating segment net income (loss) before income taxes                 (62) 298 77
Total segment net income (loss) before income taxes                 (14,091) (4,169) (2,478)
Unallocated net cost of corporate headquarters                 (5,114) [1] (3,891) [1] (4,290) [1]
Unallocated net cost of DSIT and OmniMetrix headquarters                 (1,486) 0 17
Gain on investment in GridSense                 0 0 1,327
Distribution from EnerTech                 0 0 135
Loss on Sale of EnerTech                 0 0 1,821
Gain on sale of HangXing 0 0 0 0 0 0 0 492 0 492 0
Consolidated net loss before tax (6,150) (5,698) (4,473) (4,370) (2,237) (1,786) (1,861) (1,684) (20,691) (7,568) (7,110)
Stock compensation in unallocated expenses                 $ 532 $ 458 $ 648
[1] Includes $648, $458, and $532 of stock compensation expense for the years ending December 31, 2010, 2011 and 2012, respectively.