Segment Disclosure (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenue Information by operating segment [Abstract]
Revenues	$ 86,160	[1]	$ 134,017	[1]	$ 156,487	[1]
Grid [Member]
Revenue Information by operating segment [Abstract]
Revenues	40,303		85,241		99,428
IIoT [Member]
Revenue Information by operating segment [Abstract]
Revenues	$ 45,857		$ 48,776		$ 57,059

[1] 1 Includes related party amounts of $11,763 in 2013, $6,458 in 2012, and $7,119 in 2011. See Note 12 for additional information on related party transactions.