v3.8.0.1

Income taxes - Changes in valuation allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in the valuation allowance
Balance at the beginning of the year	$ 36,331	$ 19,548	$ 12,470
Additions charged to operations	16,527	16,783	7,078
Effect of U.S. tax reform law changes	(17,868)
Decrease credited to operations	0	0	0
Balance at the end of the year	$ 34,990	$ 36,331	$ 19,548
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://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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 3: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the period of cumulative results for determination of releasing valuation allowance.

+ References

No definition available.

+ Details

Name:	wifi_PeriodOfCumulativeResultsForDeterminationOfReleasingValuationAllowance
Namespace Prefix:	wifi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the decrease in the period in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

Name:	wifi_ValuationAllowanceDeferredTaxAssetDecrease
Namespace Prefix:	wifi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

Name:	wifi_ValuationAllowanceRollForward
Namespace Prefix:	wifi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration