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Acquisitions - Additional Information (Details)
ZAR / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 12 Months Ended
Jan. 05, 2016
installment
shares
Oct. 05, 2015
USD ($)
Jun. 18, 2015
ZAR
ZAR / shares
Mar. 27, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
 [1]
Jun. 30, 2015
USD ($)
 [1]
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]                              
Non-cash change in acquisition-related escrow                         $ (8,286) $ 0 $ 0
Net revenues         $ 61,514 $ 54,267 $ 51,667 $ 53,494 $ 55,361 $ 44,330 $ 37,270 $ 48,284 220,942 185,245 335,053
Net loss                         (52,294) (39,229) $ (43,413)
Acquisition-related earn out         5,274       $ 0       5,274 $ 0  
DigiCore                              
Business Acquisition [Line Items]                              
Voting interests acquired     100.00%                        
Acquisition share price (Rand per share) | ZAR / shares     ZAR 4.40                        
Cash consideration                         79,365    
Non-cash change in acquisition-related escrow                         (8,300)    
Total preliminary purchase price   $ 80,000                     79,988    
Net revenues                         16,600    
Net loss                         (2,300)    
Equity consideration transferred                         623    
DigiCore | General and administrative expense                              
Business Acquisition [Line Items]                              
Acquisition costs                         1,700    
Feeney Wireless                              
Business Acquisition [Line Items]                              
Cash consideration       $ 9,300                 9,268    
Total preliminary purchase price       24,800                 24,777    
Net revenues                         20,200    
Net loss                         (8,300)    
Purchase consideration placed in escrow fund       1,500                      
Other assumed liabilities       500                 509    
Equity consideration transferred       15,000                 15,000    
Maximum contingent consideration       $ 25,000                      
Contingent consideration payout period       4 years                      
Acquisition-related earn out         $ 6,100               6,100    
Feeney Wireless | General and administrative expense                              
Business Acquisition [Line Items]                              
Acquisition costs                         $ 900    
Maximum | Scenario, Plan | DigiCore                              
Business Acquisition [Line Items]                              
Cash consideration | ZAR     ZAR 1,094,223,363.20                        
Subsequent Event | Feeney Wireless                              
Business Acquisition [Line Items]                              
Number of cash installments | 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                            
[1] Net revenues for the second and third quarter of 2015 have been retrospectively revised by $3.1 million and $0.3 million, respectively, to correct an immaterial error of certain contra revenue, previously reported within costs of net revenues, as a decrease to net revenues.