v3.10.0.1

Income taxes - Changes in valuation allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in the valuation allowance |  |  |
Balance at the beginning of the year | $ 34,990 | $ 36,331 | $ 19,548
Additions charged to operations |  | 16,527 | 16,783
Effect of U.S. tax reform law changes |  | (17,868) |
Decrease credited to operations | (1,180) |  |
Balance at the end of the year | $ 33,810 | $ 34,990 | $ 36,331
Period of cumulative results for determination of releasing valuation allowance | 3 years |  |

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Represents the period of cumulative results for determination of releasing valuation allowance. + References No definition available. + Details
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Namespace Prefix: | wifi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the decrease in the period in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | wifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | wifi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration