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Revenue - Contract balances (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Contract balances
Receivables, inclusive of trade and unbilled	$ 59,084	$ 59,631
Contract Assets (current and non-current)	8,699	11,278
Contract Liabilities (Deferred Revenue current and non-current)	$ 43,784	$ 44,305
Revenue, Practical Expedient, Financing Component [true/false]	true
Contract liabilities increase (decrease) due to annual renewals	$ 2,600
Minimum
Contract balances
The amount of time contract assets are transferred to receivables	3 years
Maximum
Contract balances
The amount of time contract assets are transferred to receivables	5 years

X

- Definition

The amount of time the contract assets are transferred to receivables when the right to billion normally occurs.

+ References

No definition available.

+ Details

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Namespace Prefix:	ospn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase decrease in obligation to transfer good or service to customer for which consideration from customer has been received or is due from annual renewals.

+ References

No definition available.

+ Details

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Namespace Prefix:	ospn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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+ Details

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

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Indicates (true false) whether practical expedient was elected not to adjust consideration for effect of financing component when transfer and customer payment for product or service occurs within one year or less.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 22
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+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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