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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) | 6 Months Ended
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Jun. 30, 2018 USD ($)
Statement Of Stockholders Equity [Abstract] |
Proceed from issuance of stock, issuance costs | $ 3,367,760

X
- Definition Stock issued during period new issues issuance cost. + References No definition available. + Details
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Namespace Prefix: | oss_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration