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Acquisitions and Divestitures - Narrative - Acquisitions (Details)
$ in Thousands, shares in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 05, 2016
installment
shares
Oct. 05, 2015
USD ($)
Mar. 27, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 18, 2015
ZAR / shares
Business Acquisition [Line Items]                
Acquisition-related liabilities       $ 7,384 $ 5,274 $ 7,384 $ 5,274  
DigiCore                
Business Acquisition [Line Items]                
Voting interests acquired               100.00%
Acquisition share price (ZAR per share) | ZAR / shares               ZAR 4.40
Cash payments         79,365      
Total purchase price   $ 80,000     79,988      
Future issuance of common stock         $ 623      
DigiCore | General and Administrative Expense                
Business Acquisition [Line Items]                
Acquisition costs             1,700  
Feeney Wireless                
Business Acquisition [Line Items]                
Cash payments     $ 9,300       9,268  
Total purchase price     24,800       24,777  
Escrow amount and certain other pre-closing adjustments     1,500          
Other assumed liabilities     500       509  
Future issuance of common stock     15,000       15,000  
Maximum contingent earn-out     $ 25,000          
Acquisition-related liabilities       8,200   8,200    
Number of cash installment payments | installment 5              
Period for cash installments 4 years              
Issued to former shareholders (shares) | shares 2.9              
Number of share installments | installment 3              
Period for share installments 3 years              
Earn-out related expense       1,300   2,100    
Feeney Wireless | Other Liabilities                
Business Acquisition [Line Items]                
Acquisition-related liabilities       $ 6,700   $ 6,700    
Feeney Wireless | General and Administrative Expense                
Business Acquisition [Line Items]                
Acquisition costs             $ 900