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Debt - Additional Information (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
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Feb. 16, 2022 EUR (€) | Feb. 01, 2022 EUR (€) | Jun. 18, 2021 EUR (€) | Jun. 04, 2021 EUR (€) | Apr. 09, 2021 EUR (€) | Jul. 01, 2020 | Jun. 25, 2020 EUR (€) | May 11, 2020 USD ($) | Apr. 24, 2020 USD ($) $ / shares | Apr. 20, 2020 USD ($) $ / shares | Apr. 09, 2020 EUR (€) | Apr. 01, 2019 USD ($) | Apr. 01, 2019 EUR (€) | Apr. 30, 2019 USD ($) Individual $ / shares shares | Mar. 31, 2022 USD ($) LineofCredit TermLoan $ / shares | Mar. 31, 2021 USD ($) | Mar. 31, 2022 EUR (€) LineofCredit TermLoan | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2021 EUR (€) | May 03, 2021 USD ($) | Apr. 01, 2019 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,219,128 |  | € 2,000,000 |  |  |  |
Debt discount amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,224 | $ 61,210 |  |  |  |  |
Proceeds from loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,219,128 |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |
April 2019 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000 |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |
Debt instrument, monthly / quarterly principal and interest payments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,100 |  |  |  |  |  |  |
Number of individuals | Individual |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Debt maturity term |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |
Warrants to purchase common stock percentage equal to original principal |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.15 |  |  |  |  |  |  |
Warrants to purchase common stock | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,276 |  |  |  |  |  |  |
Estimated fair value of each warrants | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.90 |  |  |  |  |  |  |
April 2019 Notes | Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrant issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,037 |  |  |  |  |  |  |
April 2019 Notes | Warrants | Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.15 |  |  |  |  |  |  |
April 2019 Notes | Warrants | Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
April 2019 Notes | Warrants | Volatility Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4460 |  |  |  |  |  |  |
April 2019 Notes | Warrants | Dividend Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 |  |  |  |  |  |  |
April 2019 Notes | Warrants | Risk-free Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.02307 |  |  |  |  |  |  |
April 2019 Related Party Notes | Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,150,000 |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |
Debt instrument, monthly / quarterly principal and interest payments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,900 |  |  |  |  |  |  |
Number of individuals | Individual |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Debt maturity term |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |
Warrants to purchase common stock percentage equal to original principal |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.15 |  |  |  |  |  |  |
Warrants to purchase common stock | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,490 |  |  |  |  |  |  |
Estimated fair value of each warrants | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.90 |  |  |  |  |  |  |
April 2019 Related Party Notes | Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrant issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,121 |  |  |  |  |  |  |
April 2019 Related Party Notes | Warrants | Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.15 |  |  |  |  |  |  |
April 2019 Related Party Notes | Warrants | Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
April 2019 Related Party Notes | Warrants | Volatility Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4260 |  |  |  |  |  |  |
April 2019 Related Party Notes | Warrants | Dividend Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 |  |  |  |  |  |  |
April 2019 Related Party Notes | Warrants | Risk-free Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.023067 |  |  |  |  |  |  |
Senior Secured Convertible Promissory Notes | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Apr. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt discount amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 7,519 |  |  |  |  |
Non-interest bearing convertible note |  |  |  |  |  |  |  |  | $ 3,000,000 | $ 6,000,000 |  |  |  |  | $ 3,000,000 |  |  |  |  |  |
Original issue discount rate |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, initial conversion price per share | $ / shares |  |  |  |  |  |  |  |  | $ 2.50 | $ 2.50 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, aggregate purchase price |  |  |  |  |  |  |  |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Non-interest bearing convertible note expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 20, 2021 |  |  |  |  |  |
Debt instrument, conversion price percentage, eligibility of conversion |  |  |  |  |  |  |  |  | 135.00% |  |  |  |  |  |  |  |  |  |  |  |
Monthly amortization payments percentage of initial principal |  |  |  |  |  | 0.04545% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  | 110.00% |  |  |  |  |  |
Remaining balance of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,590,909 |  |  |  |  |  |
Debt instrument, conversion description |  |  |  |  |  |  |  |  | Subject to the satisfaction of certain equity conditions set forth in the notes, installment amounts could be satisfied in shares of our common stock, with such installment conversion at a conversion price equal to the lower of (i) the conversion price then in effect; and (ii) the greater of (x) the floor price of $1.00 (80% of the Nasdaq market price at date of purchase agreement) and (y) the lower of (I) 82.5% the volume weighted average price of our common stock on the trading day immediately before the applicable installment date and (II) 82.5% of the quotient of (A) the sum of the volume weighted average price of our common stock for each of the three (3) trading days with the lowest volume weighted average price of our common stock during the twenty (20) consecutive trading day period ending and including the trading day immediately prior to the applicable installment date, divided by (B) three (3). |  |  |  |  |  |  |  |  |  |  |  |
Percentage of market price |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Volume weighted average price of common stock period |  |  |  |  |  |  |  |  | 3 days |  |  |  |  |  |  |  |  |  |  |  |
Volume weighted average price period |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days, shares pre-delivered |  |  |  |  |  |  |  |  | 2 days |  |  |  |  |  |  |  |  |  |  |  |
Debt discount amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,161 | 50,928 |  |  |  |  |
Original issue discount rate |  |  |  |  |  |  |  |  | $ 316,274 |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,223 | $ 53,690 |  |  |  |  |
PPP Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from loan |  |  |  |  |  |  |  | $ 1,499,360 |  |  |  |  |  |  |  |  |  |  |  |  |
Loan fully forgiven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,499,360 |
Accrued interest fully forgiven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,994 |
PPP Loan | Two Year Promissory Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Apr. 28, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Senior Secured Convertible Promissory Notes | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume weighted average price percentage |  |  |  |  |  |  |  |  | 82.50% |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Senior Secured Convertible Promissory Notes | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion floor price | $ / shares |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |
Volume weighted average price percentage |  |  |  |  |  |  |  |  | 82.50% |  |  |  |  |  |  |  |  |  |  |  |
Bressner Technology GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of term loans outstanding | TermLoan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 4 |  |  |  |
Debt instrument, face amount | € | € 500,000 | € 500,000 | € 500,000 | € 500,000 | € 500,000 |  | € 500,000 |  |  |  | € 500,000 |  |  |  |  |  |  |  |  |  |
Bressner Technology GmbH | Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,219,128 |  | € 2,000,000 |  |  |  |
Bressner Technology GmbH | Note Payable Maturing on March 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 586,189 |  |  |  |  |  |  |  |  | € 500,000
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  | 2.25%
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  | Mar. 30, 2021 | Mar. 30, 2021 |  |  |  |  |  |  |  |
Debt instrument, monthly / quarterly principal and interest payments |  |  |  |  |  |  |  |  |  |  |  | $ 24,960 | € 22,232 |  |  |  |  |  |  |  |
Term Loans | Bressner Technology GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 554,782 |  | € 500,000 | 568,825 | € 500,000 |  |
Debt instrument, interest rate | 1.58% | 1.95% | 1.487% | 1.55% | 1.60% |  | 1.87% |  |  |  | 1.90% |  |  |  | 1.685% |  | 1.685% |  |  |  |
Debt instrument, maturity date | Aug. 16, 2022 | Aug. 01, 2022 | Dec. 17, 2021 | Nov. 30, 2021 | Sep. 30, 2021 |  | Jun. 18, 2021 |  |  |  | Apr. 09, 2021 |  |  |  | Mar. 31, 2022 |  |  |  |  |  |
Debt instrument, extended maturity date |  |  | Jun. 17, 2022 |  | Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
German Institutions | Revolving Credit Facility | Bressner Technology GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lines of credit | LineofCredit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |
Total outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |
German Institutions | Revolving Credit Facility | Bressner Technology GmbH | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,441,041 |  | € 2,200,000 |  |  |  |
Line of credit current rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
German Institutions | Revolving Credit Facility | Bressner Technology GmbH | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit current rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10% |  |  |  |  |  |
Line of Credit from VR Bank | Term Loans | Bressner Technology GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 554,782 |  | 500,000 |  |  |  |
Line of Credit from UniCredit Bank | Term Loans | Bressner Technology GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate balance outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 554,782 |  | € 500,000 |  |  |  |

X
- Definition Accrued interest fully forgiven. + References No definition available. + Details
Name: | oss_AccruedInterestFullyForgiven
Namespace Prefix: | oss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Class of warrant or right outstanding per warrant. + References No definition available. + Details
Name: | oss_ClassOfWarrantOrRightOutstandingPerWarrant
Namespace Prefix: | oss_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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