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Acquisitions - Narrative (Details)
ZAR / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 05, 2015
ZAR
Oct. 05, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 18, 2015
ZAR
ZAR / shares
Mar. 27, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                    
Non-cash change in acquisition-related escrow           $ 10,533 $ 0 $ 10,317 $ 0  
Acquisition-related earn out     $ 4,024     4,024   4,024   $ 0
Net revenues           54,577 44,330 162,886 129,884  
Net loss           20,847 $ 8,832 37,893 $ 35,228  
Feeney Wireless                    
Business Acquisition [Line Items]                    
Net revenues           5,500   17,700    
Net loss           (3,800)   (5,100)    
DigiCore                    
Business Acquisition [Line Items]                    
Voting interests acquired       100.00%            
Acquisition share price (ZAR per share) | ZAR / shares       ZAR 4.40            
Non-cash change in acquisition-related escrow               10,300    
Acquisition costs           500   1,600    
DigiCore | Maximum                    
Business Acquisition [Line Items]                    
Cash payments     78,000              
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          
Period to pay contingent earn-out         4 years          
Feeney Wireless | Accrued Liabilities                    
Business Acquisition [Line Items]                    
Acquisition-related earn out     $ 4,000     4,000   4,000    
Feeney Wireless | General and Administrative Expense                    
Business Acquisition [Line Items]                    
Acquisition costs           $ 100   $ 900    
Subsequent Event | DigiCore | Maximum                    
Business Acquisition [Line Items]                    
Cash payments ZAR 1,085,705,720.98 $ 79,000                
Scenario, Plan | DigiCore | Maximum                    
Business Acquisition [Line Items]                    
Cash payments | ZAR       ZAR 1,094,223,363.20