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Subsequent Events - Addtional Informartion (Details) - Subsequent Event | Jul. 30, 2018 ft²
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Subsequent Event [Line Items] |
Lease extension term | 6 years
Increase in size of the facility | 6,121
New leases effective date | Sep. 01, 2108

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- Definition Increase in area of real estate property. + References No definition available. + Details
Name: | oss_IncreaseInAreaOfRealEstateProperty
Namespace Prefix: | oss_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee leasing arrangements operating leases effective date. + References No definition available. + Details
Name: | oss_LesseeLeasingArrangementsOperatingLeasesEffectiveDate
Namespace Prefix: | oss_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee leasing arrangements operating leases extened term. + References No definition available. + Details
Name: | oss_LesseeLeasingArrangementsOperatingLeasesExtenedTerm
Namespace Prefix: | oss_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |