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Revenue, Deferred Revenue And Prepaid Commissions - Prepaid Commissions (Details) - Prepaid Commissions $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Capitalized Contract Cost
Beginning balance	$ 2,290
Additions	2,863
Commissions Recognized	(3,273)
Ending balance	$ 1,880

X

- Definition

Capitalized Contract Cost, Amount Recognized

+ References

No definition available.

+ Details

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Namespace Prefix:	spok_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	spok_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Increase (Decrease) To Capitalized Contract Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	spok_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_CapitalizedContractCostAxis=spok_SalesCommissionsMember
Namespace Prefix:
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Balance Type:
Period Type: