XML 65 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Balance Sheet Details - Summary of Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 34,408 | $ 39,241
Gross Unrealized Gains | 4 | 24
Gross Unrealized Losses | (40) | 0
Estimated Fair Value | 34,372 | 39,265
Short-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,793 | 38,041
Gross Unrealized Gains | 4 | 23
Gross Unrealized Losses | (11) | 0
Estimated Fair Value | 22,786 | 38,064
Long-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,615 | 1,200
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (29) | 0
Estimated Fair Value | 11,586 | 1,201
Government agency securities [Member] | Short-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 1,004 | 3,265
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,004 | 3,266
Municipal bonds [Member] | Short-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 10,576 | 11,246
Gross Unrealized Gains | 4 | 14
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 10,580 | 11,260
Municipal bonds [Member] | Long-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 to 2 |
Amortized Cost | 157 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 157 |
Certificates of deposit [Member] | Short-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 4,520 | 6,200
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4,520 | 6,205
Certificates of deposit [Member] | Long-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 to 2 | 1 to 2
Amortized Cost | 3,220 | 1,200
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 3,220 | 1,201
Corporate debentures / bonds [Member] | Short-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 6,693 | 17,330
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (11) | 0
Estimated Fair Value | 6,682 | 17,333
Corporate debentures / bonds [Member] | Long-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 to 2 |
Amortized Cost | 8,238 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (29) |
Estimated Fair Value | $ 8,209 |

X
- Definition Marketable securities maturity in years. + References No definition available. + Details
Name: | nvtl_MarketableSecuritiesMaturityInYears
Namespace Prefix: | nvtl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration