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Acquisitions and Divestitures - Narrative (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 ($)	Dec. 31, 2015 USD ($)	Apr. 11, 2016 USD ($)	Mar. 31, 2016 USD ($)
Business Acquisition [Line Items]
Acquisition-related liabilities					$ 5,274	$ 5,274		$ 7,912
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					$ 6,100	6,100
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
Feeney Wireless | General and Administrative Expense
Business Acquisition [Line Items]
Acquisition costs						$ 900
Subsequent Event
Business Acquisition [Line Items]
Initial purchase price, Divestiture							$ 11,000
Additional cash payment, Divestiture							$ 3,800
Scenario, Plan | DigiCore | Maximum
Business Acquisition [Line Items]
Cash payments | ZAR			ZAR 1,094,223,363.20

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