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Significant Accounting Policies - Additional Information (Details 1) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Fixed Fee Contract |  |
Significant Accounting Policies [Line Items] |  |
Remaining performance obligation expected to be recognized | $ 0 | $ 317,718

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- Definition Significant accounting policies. + References No definition available. + Details
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Namespace Prefix: | oss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |