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Acquisitions and Divestitures - Narrative - Acquisitions (Details) $ in Thousands, shares in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 05, 2016 installment shares | Oct. 05, 2015 USD ($) | Mar. 27, 2015 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 18, 2015 ZAR / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related liabilities |  |  |  | $ 5,274 | $ 8,689 | $ 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 |  |  |  | $ 6,900 |  | 6,900 |
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 |  |  |  |  |  |
Contingent consideration expense |  |  |  |  | 800 |  |
Feeney Wireless | Other Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related liabilities |  |  |  |  | $ 6,100 |  |
Feeney Wireless | General and Administrative Expense |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  | $ 900 |

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