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Segment Information and Concentrations of Risk - Schedule of Net Revenues, Operating Income (Loss) and Identifiable Assets of Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net revenues by reportable segment: |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 55,361 us-gaap_Revenues | $ 44,330 us-gaap_Revenues | $ 37,270 us-gaap_Revenues | $ 48,284 us-gaap_Revenues | $ 65,335 us-gaap_Revenues | $ 92,673 us-gaap_Revenues | $ 91,124 us-gaap_Revenues | $ 85,921 us-gaap_Revenues | $ 185,245 us-gaap_Revenues | $ 335,053 us-gaap_Revenues | $ 344,288 us-gaap_Revenues
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Operating loss: |  |  |  |  |  |  |  |  | (35,573)us-gaap_OperatingIncomeLoss | (43,221)us-gaap_OperatingIncomeLoss | (88,743)us-gaap_OperatingIncomeLoss
Identifiable assets by reportable segment: |  |  |  |  |  |  |  |  |  |  |
Identifiable assets by reportable segment: | 95,020 us-gaap_Assets |  |  |  | 111,465 us-gaap_Assets |  |  |  | 95,020 us-gaap_Assets | 111,465 us-gaap_Assets |
Mobile Computing Products |  |  |  |  |  |  |  |  |  |  |
Net revenues by reportable segment: |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 145,500 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember | 297,499 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember | 312,508 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Operating loss: |  |  |  |  |  |  |  |  | (23,339)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember | (27,939)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember | (22,924)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember
Identifiable assets by reportable segment: |  |  |  |  |  |  |  |  |  |  |
Identifiable assets by reportable segment: | 79,368 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember |  |  |  | 96,516 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember |  |  |  | 79,368 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember | 96,516 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = nvtl_MobileComputingProductsMember |
M2M Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Net revenues by reportable segment: |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 39,745 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember | 37,554 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember | 31,780 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |
Operating loss: |  |  |  |  |  |  |  |  | (12,234)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember | (15,282)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember | (65,819)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember
Identifiable assets by reportable segment: |  |  |  |  |  |  |  |  |  |  |
Identifiable assets by reportable segment: | $ 15,652 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember |  |  |  | $ 14,949 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember |  |  |  | $ 15,652 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember | $ 14,949 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_TradeSecretsMember |

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