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Acquisitions - Schedule of Adjusted Pro Forma Expenses (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Business Combinations [Abstract]
Record amortization expense of intangible assets acquired	$ 100,000

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- Definition

Amortization expense of intangible assets acquired.

+ References

No definition available.

+ Details

Name:	BOXL_AmortizationExpenseOfIntangibleAssetsAcquired
Namespace Prefix:	BOXL_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration