v3.20.4

Income taxes - Changes in valuation allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in the valuation allowance |  |  |
Balance at the beginning of the year | $ 41,646 | $ 33,810 | $ 34,990
Decrease credited to operations | (3) | (7) | (1,180)
Additions charged to operations | 4,816 | 7,843 |
Balance at the end of the year | $ 46,459 | 41,646 | $ 33,810
Period of cumulative results for determination of releasing valuation allowance | 3 years |  |
Uncertain tax positions | $ 0 | $ 0 |

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://www.xbrl.org/2003/role/disclosureRef -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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
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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
Period Type: | duration

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

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- References No definition available. + Details
Name: | wifi_ValuationAllowanceRollForward
Namespace Prefix: | wifi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration