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Acquisitions - Additional Information (Details) ZAR / shares in Units, $ in Thousands, shares in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended
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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.

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