Receivables (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in allowance for doubtful accounts
Beginning Balance	$ 3,942,000	$ 2,631,000	$ 2,924,000
Additional Charges to Costs and Expenses	3,590,000	3,455,000	716,000
Recoveries to (Deductions from) Allowance	(3,777,000)	(2,144,000)	(1,009,000)
Ending Balance	3,755,000	3,942,000	2,631,000
Wavecom Solutions Corporation
Changes in allowance for doubtful accounts
Settlement gain on pre-existing relationship			$ 4,000,000