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Summary of Significant Accounting Policies - Other Income (Expense), Net and Accounting leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Other Income (Expense), Net
Government subsidy from a foreign government	$ 1.2

X

- Definition

The amount of government subsidy received from foreign government to support the advancement of technology.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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