LOAN PAYABLE	3 Months Ended
Mar. 31, 2018
LOAN PAYABLE
LOAN PAYABLE	8.LOAN PAYABLE In October 2012, the Company entered into a loan agreement with the Massachusetts Development Finance Agency (“MassDev”). The loan agreement provided the Company with a $2,000 line of credit from the Commonwealth of Massachusetts’ Emerging Technology Fund, with $200 designated to be used for working capital purposes and the remainder to be used for the purchase of capital equipment. The annual interest rate on the loan is fixed at 6.5% with interest-only payments for the first thirty months, commencing on November 1, 2012, and then equal installments of interest and principal over the next fifty-four months, until the final maturity of the loan on October 5, 2019. Commencing on May 1, 2015, equal monthly payments of $41 are due until loan maturity. As of March 31, 2018, $341 and $400 in principal payments will be due for the years ending December 31, 2018 and 2019, respectively. Subsequent to March 31, 2018, in order to obtain the consent of MassDev for facility changes , including the assignment of the Cambridge Lease, and the sale of certain assets, the Company agreed to pay down $300 of principal on the MassDev loan (Note 15). In October 2012, as part of the agreement, the Company issued MassDev a warrant for the purchase of 362 shares of the Company’s common stock. The warrant has a seven-year term and is exercisable at $166 per share. The fair value of the warrant was determined to be $32 and is being amortized through interest expense over the life of the note. Amortization expense was $1 in each of the three-month periods ended March 31, 2018 and 2017. This amortization expense was included in interest expense in the Company’s consolidated statements of operations. The equipment line of credit is secured by substantially all the assets of the Company, excluding intellectual property. Interest expense related to this loan for the three-month periods ended March 31, 2018 and 2017 was $14 and $20, respectively.

8.LOAN PAYABLE

In October 2012, the Company entered into a loan agreement with the Massachusetts Development Finance Agency (“MassDev”). The loan agreement provided the Company with a $2,000 line of credit from the Commonwealth of Massachusetts’ Emerging Technology Fund, with $200 designated to be used for working capital purposes and the remainder to be used for the purchase of capital equipment. The annual interest rate on the loan is fixed at 6.5% with interest-only payments for the first thirty months, commencing on November 1, 2012, and then equal installments of interest and principal over the next fifty-four months, until the final maturity of the loan on October 5, 2019. Commencing on May 1, 2015, equal monthly payments of $41 are due until loan maturity. As of March 31, 2018, $341 and $400 in principal payments will be due for the years ending December 31, 2018 and 2019, respectively. Subsequent to March 31, 2018, in order to obtain the consent of MassDev for facility changes , including the assignment of the Cambridge Lease, and the sale of certain assets, the Company agreed to pay down $300 of principal on the MassDev loan (Note 15). In October 2012, as part of the agreement, the Company issued MassDev a warrant for the purchase of 362 shares of the Company’s common stock. The warrant has a seven-year term and is exercisable at $166 per share. The fair value of the warrant was determined to be $32 and is being amortized through interest expense over the life of the note. Amortization expense was $1 in each of the three-month periods ended March 31, 2018 and 2017. This amortization expense was included in interest expense in the Company’s consolidated statements of operations. The equipment line of credit is secured by substantially all the assets of the Company, excluding intellectual property. Interest expense related to this loan for the three-month periods ended March 31, 2018 and 2017 was $14 and $20, respectively.