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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical)	6 Months Ended
	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

X

- References

No definition available.

+ Details

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