Acquisitions (Details) (USD $)	3 Months Ended								12 Months Ended			1 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Acquisitions
Cash paid, net of cash acquired and final purchase price adjustments										$ 11,858,000	$ 8,343,000
Revenue	99,631,000	97,252,000	96,784,000	97,072,000	100,506,000	97,682,000	96,997,000	95,965,000	390,739,000	391,150,000	385,498,000
Net income	1,976,000	1,516,000	2,239,000	2,368,000	2,628,000	2,061,000	3,951,000	1,848,000	8,099,000	10,488,000	109,982,000
Assets -
Goodwill	12,104,000				12,104,000				12,104,000	12,104,000
System Metrics Corporation
Acquisitions
Total purchase price												16,300,000
Cash paid, net of cash acquired and final purchase price adjustments												11,900,000
Period over which earn-out is to be paid												3 years
Contingent earn-out consideration payable	1,100,000								1,100,000
Transaction costs					900,000					900,000
Revenue										2,200,000
Net income										(200,000)
Assets -
Property and equipment					3,781,000					3,781,000
Intangible assets recognized					4,380,000					4,380,000
Goodwill					10,527,000					10,527,000
Other assets					643,000					643,000
Assets					19,331,000					19,331,000
Liabilities -
Current liabilities					3,679,000					3,679,000
Non-current liabilities					2,636,000					2,636,000
Deferred income taxes					1,158,000					1,158,000
Liabilities					7,473,000					7,473,000
Net acquisition price					11,858,000					11,858,000
Supplemental Unaudited Pro Forma Information
Revenues										396,950,000	393,280,000
Net income										(10,940,000)	(109,438,000)
System Metrics Corporation | Recognized as of Acquisition
Assets -
Property and equipment					3,781,000					3,781,000
Intangible assets recognized					4,380,000					4,380,000
Goodwill					10,368,000					10,368,000
Other assets					643,000					643,000
Assets					19,172,000					19,172,000
Liabilities -
Current liabilities					3,684,000					3,684,000
Non-current liabilities					2,304,000					2,304,000
Deferred income taxes					1,326,000					1,326,000
Liabilities					7,314,000					7,314,000
Net acquisition price					11,858,000					11,858,000
System Metrics Corporation | Measurement Period Adjustments
Assets -
Goodwill					159,000					159,000
Assets					159,000					159,000
Liabilities -
Current liabilities					(5,000)					(5,000)
Non-current liabilities					332,000					332,000
Deferred income taxes					(168,000)					(168,000)
Liabilities					159,000					159,000
Wavecom Solutions Corporation
Acquisitions
Cash paid, net of cash acquired and final purchase price adjustments											8,700,000
Transaction costs											800,000
Revenue											394,159,000
Net income											(106,124,000)
Assets -
Property and equipment					12,774,000					12,774,000
Intangible assets recognized					650,000					650,000
Goodwill					1,577,000					1,577,000
Deferred income taxes					488,000					488,000
Other assets					1,663,000					1,663,000
Assets					17,152,000					17,152,000
Liabilities -
Current liabilities					2,360,000					2,360,000
Non-current liabilities					2,100,000					2,100,000
Payable from Wavecom to the Company					4,037,000					4,037,000
Liabilities					8,497,000					8,497,000
Net acquisition price					8,655,000					8,655,000
Settlement gain on pre-existing relationship											4,000,000
Settlement gain offset by bad debt expense											2,500,000
Wavecom Solutions Corporation | Recognized as of Acquisition
Assets -
Property and equipment					11,898,000					11,898,000
Intangible assets recognized					1,060,000					1,060,000
Goodwill					1,569,000					1,569,000
Other assets					1,663,000					1,663,000
Assets					16,190,000					16,190,000
Liabilities -
Current liabilities					2,360,000					2,360,000
Non-current liabilities					1,450,000					1,450,000
Payable from Wavecom to the Company					4,037,000					4,037,000
Liabilities					7,847,000					7,847,000
Net acquisition price					8,343,000					8,343,000
Wavecom Solutions Corporation | Measurement Period Adjustments
Assets -
Property and equipment					876,000					876,000
Intangible assets recognized					(410,000)					(410,000)
Goodwill					8,000					8,000
Deferred income taxes					488,000					488,000
Assets					962,000					962,000
Liabilities -
Non-current liabilities					650,000					650,000
Liabilities					650,000					650,000
Net acquisition price					$ 312,000					$ 312,000