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Acquisitions - Narrative (Details)
ZAR / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 18, 2015
ZAR
ZAR / shares
Jun. 18, 2015
USD ($)
Mar. 27, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                
Acquisition-related earn out       $ 1,446   $ 1,446   $ 0
Net revenues       54,815 $ 37,270 108,309 $ 85,554  
Net loss       9,220 $ 17,415 17,046 $ 26,396  
Feeney Wireless                
Business Acquisition [Line Items]                
Net revenues       11,900   12,200    
Net loss       (900)   (1,300)    
DigiCore                
Business Acquisition [Line Items]                
Voting interests acquired 100.00%              
Acquisition share price (ZAR per share) | ZAR / shares ZAR 4.40              
Total purchase price   $ 87,000            
DigiCore | Maximum                
Business Acquisition [Line Items]                
Cash payments ZAR 1,094,223,363.20 $ 88,300            
Feeney Wireless                
Business Acquisition [Line Items]                
Total purchase price     $ 24,800     24,777    
Cash payments     9,300     9,268    
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          
Period to pay contingent earn-out     4 years          
Feeney Wireless | Accrued Liabilities                
Business Acquisition [Line Items]                
Acquisition-related earn out       1,400   1,400    
Feeney Wireless | General and Administrative Expense                
Business Acquisition [Line Items]                
Acquisition costs       $ 200   $ 800