Debt (Details Textual) - USD ($) | Jul. 15, 2017 | Aug. 10, 2015 | Oct. 31, 2017 | Jan. 17, 2017 | Apr. 14, 2016 | Jul. 31, 2015 | Dec. 31, 2017 | Sep. 30, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | May 11, 2017 | Dec. 31, 2016 | Sep. 27, 2016 | Aug. 12, 2016 | Jul. 29, 2016 | May 25, 2016 |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | $ 65,000,000 | | | | | | | | | | | |
Conversion of Stock, Amount Converted | | | | | | | | | | $ 480,000 | $ 0 | | | | | | |
Business Acquisition, Percentage of Voting Interests Acquired | | | | | | 100.00% | | | | | | | | | | | |
Business Combination Conjunction Related Expenses | | | | | | $ 4,900,000 | | | | | | | | | | | |
Payments of Debt Issuance Costs | | | | | | $ 4,700,000 | | | | | | | | | | | |
Debt Instrument, Interest Rate Terms | to 6.00% per annum plus 100 basis points. | | | | | | | | | | | | | | | | |
Debt Instrument Convertible Extent Not Convertible Beneficial Ownership Percentage | | | | | | | | 9.99% | | 9.99% | | | | | | | |
Interest Payable | | | | | | | | $ 10,109,062 | | $ 10,109,062 | | | $ 7,648,776 | | | | |
Scenario, Forecast [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Revenues | | | | | | | $ 27,500,000 | | | | | | | | | | |
PIK Notes SPA [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 67,145 | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price | | | | $ 0.7589 | | | | | | | | | | | | | |
Debt Instrument, Maturity Date | | | | Jul. 15, 2021 | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 6.00% | | | | | | | | | | | | | |
Indenture Notes SPA [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 1,560,000 | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price | | | | $ 0.7589 | | | | | | | | | | | | | |
Debt Instrument, Maturity Date | | | | Jul. 15, 2021 | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 6.00% | | | | | | | | | | | | | |
Indenture Common Stock SPA [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | | | | 843,289 | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price | | | | $ 0.5692 | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | | $ 16,000,000 | | | | | | | | | | | | | |
Xspine [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate During Period | | | | | | 6.00% | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | $ 15,000,000 | | | | | |
New Facility [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Expiration Date | | | | | | Jul. 31, 2020 | | | | | | | | | | | |
New Facility [Member] | First Period [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument Interest Rate Portion Payable In Cash | | | | | | 9.00% | | | | | | | | | | | |
Debt Instrument Interest Rate Portion Payable In Kind | | | | | | 14.00% | | | | | | | | | | | |
Debt Instrument Interest Rate Addition To Pik Portion | | | | | | 1.00% | | | | | | | | | | | |
Debt Instrument Interest Rate Pik Portion Subtraction | | | | | | 9.00% | | | | | | | | | | | |
New Facility [Member] | Second Period [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument Interest Rate Portion Payable In Cash | | | | | | 12.00% | | | | | | | | | | | |
Debt Instrument Interest Rate Portion Payable In Kind | | | | | | 14.00% | | | | | | | | | | | |
Debt Instrument Interest Rate Addition To Pik Portion | | | | | | 1.00% | | | | | | | | | | | |
Debt Instrument Interest Rate Pik Portion Subtraction | | | | | | 12.00% | | | | | | | | | | | |
Fourth Amendment To Amended And Restated Credit Agreement [Member] | OrbiMed and ROS [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument Additional Tranche Commitment | | | | | | | | | | | | | | | | $ 1,000,000 | |
Debt Instrument Additional Tranche Commitment Outstanding | | | | | | | | | | | | | | | | $ 43,000,000 | |
Sixth Amendement To Restated New Credit Faciltiy [Member] | Minimum [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line Of Credit Facility Loans Outstanding Payment Fee Percentage | | | | | | | | | | | | | | 7.50% | | | |
Sixth Amendement To Restated New Credit Faciltiy [Member] | Maximum [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line Of Credit Facility Loans Outstanding Payment Fee Percentage | | | | | | | | | | | | | | 9.00% | | | |
Seventh Amendement To Restated New Credit Faciltiy [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from January 2, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate (as defined in the New Facility) for the fiscal quarter ended on December 31, 2016, or 1%. | | | | | | | |
Interest Payable | $ 1,147,329.47 | | | | | | | | | | | | | | | | |
Twelfth Amendement To Restated New Credit Faciltiy [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from April 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on March 31, 2017, or 1%. | | | | | | | |
Twelfth Amendement To Restated New Credit Faciltiy [Member] | Fiscal Quarter Ended on March 31, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | interest accrued on such interest from April 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on March 31, 2017, or 1%. | | | | | | | | | | | | | | | | |
Interest Payable | $ 1,139,597 | | | | | | | | | | | | | | | | |
Fifteenth Amendement To Restated New Credit Faciltiy [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from July 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on June 30, 2017, or 1%. | | | | | | | |
Sixteenth Amendment to Amended and Restated Credit Agreement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from January 2, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate (as defined in the New Facility) for the fiscal quarter ended on December 31, 2016, or 1%. | | | | | | | |
Sixteenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended on March 31, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from April 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on March 31, 2017, or 1%. | | | | | | | |
Sixteenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended on June 30, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | interest accrued on such interest from July 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on June 30, 2017, or 1%. | | | | | | | | | interest accrued on such interest from July 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on June 30, 2017, or 1%. | | | | | | | |
Interest Payable | $ 1,169,544 | | | | | | | | | | | | | | | | |
Seventeenth Amendment to Amended and Restated Credit Agreement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line Of Credit Facility Minimum Expected Liquidity | | | | | | | | $ 5,000,000 | | $ 5,000,000 | | | | | | | |
Seventeenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended on March 31, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from April 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on March 31, 2017, or 1%. | | | | | | | |
Seventeenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended on December 31, 2016 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from January 2, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate (as defined in the New Facility) for the fiscal quarter ended on December 31, 2016, or 1%. | | | | | | | |
Seventeenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended on June 30, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | interest accrued on such interest from July 1, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on June 30, 2017, or 1%. | | | | | | | |
Amendment Number 1 to Indenture [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate Terms | | | | | | | | to 6.00% per annum plus 100 basis points. | | | | | | | | | |
Convertible Notes Payable [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | $ 52,000,000 | | | | | | | | | | | |
Debt Instrument Purchase Of Additional Notes | | $ 3,000,000 | | | | | | | | | | | | | | | |
Conversion of Stock, Shares Converted | | | | | | 257.5163 | | | | | | | | | | | |
Conversion of Stock, Amount Converted | | | | | | $ 1,000 | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price | | | | | | $ 3.88 | | | | | | | | | | | |
Term Loan [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Current Borrowing Capacity | | | | | | $ 42,000,000 | | | | | | | | | | | |
Subsequent Event [Member] | Sixteenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended On September 30, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Interest Payable | | | $ 1,482,406 | | | | | | $ 1,482,406 | | | | | | | | |
Subsequent Event [Member] | Seventeenth Amendment to Amended and Restated Credit Agreement [Member] | Xtant Medical Holdings and Subsidiaries [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line Of Credit Facility Minimum Expected Liquidity | | | $ 500,000 | | | | | | $ 500,000 | | | | | | | | |
Subsequent Event [Member] | Eighteenth Amendment to Amended and Restated Credit Agreement [Member] | Fiscal Quarter Ended On September 30, 2017 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | interest accrued on such interest from October 2, 2017 until paid at a rate equal to 14% plus the higher of the LIBO Rate for the fiscal quarter ended on June 30, 2017, or 1%. | | | | | | | | | | | | | | |
Silicon Valley Bank [Member] | Revolving Credit Facility [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | | | | | | $ 6,000,000 |
Silicon Valley Bank [Member] | First Loan Modification Agreement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | | | | $ 11,000,000 | | |
Convertible Senior Unsecured Notes [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | $ 2,238,166 | | | | | | | | | | | | |
Debt Instrument, Interest Rate During Period | | | | | 6.00% | | | | | | | | | | | | |
Conversion of Stock, Shares Converted | | | | | 344.8276 | | | | | | | | | | | | |
Conversion of Stock, Amount Converted | | | | | $ 1,000 | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price | | | | | $ 2.90 | | | | | | | | | | | | |
Convertible Senior Unsecured Notes [Member] | Subsequent Event [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate Terms | | | | | | | | | to 6.00% per annum plus 100 basis points. | | | | | | | | |
Convertible Promissory Notes [Member] | PIK Notes SPA [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | 2,238,166 | | | | | | | | | | | | | |
Convertible Promissory Notes [Member] | Indenture Notes SPA [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 52,000,000 | | | | | | | | | | | | | |