DEBT	3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]
DEBT	Debt On March 8, 2016, the Company entered into a $15.0 million debt financing with SVB which on September 9, 2016, was replaced by an expanded term loan and revolving line of credit agreement with SVB and MidCap, which together provide access to up to $20 million. The updated debt financing consists of a $4.0 million term loan which was drawn at the closing, a $4.0 million term loan which was drawn upon in November 2016, a $2.0 million term loan available upon the FDA's approval of the MACI BLA which is no longer available as it was not drawn on upon by April 12, 2017 and up to $10.0 million of a revolving line of credit. The term loans are interest only (indexed to Wall Street Journal (WSJ) Prime plus 5.00%) until September 1, 2017 followed by 36 equal monthly payments of principal plus interest maturing September 9, 2020. The revolving credit is limited to a borrowing base calculated using eligible accounts receivable and maturing September 9, 2020 with an interest rate indexed to WSJ Prime plus 1.25%. The Company is subject to various financial and nonfinancial covenants including but not limited to monthly minimum net revenue covenants (determined in accordance with GAAP), measured on a trailing twelve month basis. SVB and MidCap have the ability to call debt based on material adverse change clauses which are subjectively determinable and result in a subjective acceleration clause. SVB and MidCap have a shared first priority perfected security interest in all assets of the Company other than intellectual property. As of March 31, 2017, there was an outstanding balance of $8.0 million under the term loan and $2.5 million under the revolving line of credit. The weighted average interest rate on the outstanding term and revolving credit loans as of March 31, 2017 was 7.8%. As of March 31, 2017, the Company was not in compliance with the minimum revenue covenant. On May 9, 2017, the Company entered into an amendment to the SVB-MidCap Facility to enable compliance with the monthly net revenue requirement covenants, measured on a trailing twelve month basis as of March 31, 2017. The amendment decreased the 12 month trailing minimum revenue covenant as of March 31, 2017 and revised the December 31, 2017 minimum revenue covenant to $51.7 million. The amount of eligible account receivables used to calculate the availability under the revolving line of credit was reduced. As of March 31, 2017, there was $0.3 million remaining capacity under the revolving line of credit.

Debt

On March 8, 2016, the Company entered into a $15.0 million debt financing with SVB which on September 9, 2016, was replaced by an expanded term loan and revolving line of credit agreement with SVB and MidCap, which together provide access to up to $20 million. The updated debt financing consists of a $4.0 million term loan which was drawn at the closing, a $4.0 million term loan which was drawn upon in November 2016, a $2.0 million term loan available upon the FDA's approval of the MACI BLA which is no longer available as it was not drawn on upon by April 12, 2017 and up to $10.0 million of a revolving line of credit. The term loans are interest only (indexed to Wall Street Journal (WSJ) Prime plus 5.00%) until September 1, 2017 followed by 36 equal monthly payments of principal plus interest maturing September 9, 2020. The revolving credit is limited to a borrowing base calculated using eligible accounts receivable and maturing September 9, 2020 with an interest rate indexed to WSJ Prime plus 1.25%. The Company is subject to various financial and nonfinancial covenants including but not limited to monthly minimum net revenue covenants (determined in accordance with GAAP), measured on a trailing twelve month basis. SVB and MidCap have the ability to call debt based on material adverse change clauses which are subjectively determinable and result in a subjective acceleration clause. SVB and MidCap have a shared first priority perfected security interest in all assets of the Company other than intellectual property. As of March 31, 2017, there was an outstanding balance of $8.0 million under the term loan and $2.5 million under the revolving line of credit. The weighted average interest rate on the outstanding term and revolving credit loans as of March 31, 2017 was 7.8%.

As of March 31, 2017, the Company was not in compliance with the minimum revenue covenant. On May 9, 2017, the Company entered into an amendment to the SVB-MidCap Facility to enable compliance with the monthly net revenue requirement covenants, measured on a trailing twelve month basis as of March 31, 2017. The amendment decreased the 12 month trailing minimum revenue covenant as of March 31, 2017 and revised the December 31, 2017 minimum revenue covenant to $51.7 million. The amount of eligible account receivables used to calculate the availability under the revolving line of credit was reduced. As of March 31, 2017, there was $0.3 million remaining capacity under the revolving line of credit.