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v3.20.4

Summary of Significant Accounting Policies - Other Income (Expense), Net and Accounting leases (Details) $ in Millions | 12 Months Ended
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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