Notes Payable	9 Months Ended
Sep. 30, 2018
Notes Payable
Notes Payable	6.Notes Payable On August 27, 2014, the Company entered into a credit facility with MidCap Financial Trust, Flexpoint MCLS SPV LLC and Square 1 Bank, which was subsequently amended in March and December 2015 (as amended, the “Credit Facility”). The Credit Facility provided for maximum borrowings of $25.0 million. The Company received total proceeds of $10.0 million under term loans and the remaining amounts available for borrowing under this arrangement expired unused as of July 31, 2015. All amounts outstanding under the Credit Facility were due on October 1, 2018 and were collateralized by substantially all of the Company’s personal property, other than its intellectual property. As of September 30, 2018, principal and interest due under the Credit Facility had been paid. A final payment equal to 3.48% of the amounts drawn under the Credit Facility was due upon the earlier of the maturity date, acceleration of the term loans or prepayment of all or part of the term loans. The final payment was accrued as additional interest expense using the effective-interest method from the date of issuance through the maturity date and recorded within other current liabilities. The final payment was made in October 2018. The Company recognized $10 thousand and $0.1 million of interest expense related to the Credit Facility in the three-month periods ending September 30, 2018 and 2017, respectively. The Company recognized $0.1 million and $0.4 million of interest expense related to the Credit Facility in the nine-month periods ending September 30, 2018 and 2017, respectively.

6.Notes Payable

On August 27, 2014, the Company entered into a credit facility with MidCap Financial Trust, Flexpoint MCLS SPV LLC and Square 1 Bank, which was subsequently amended in March and December 2015 (as amended, the “Credit Facility”). The Credit Facility provided for maximum borrowings of $25.0 million. The Company received total proceeds of $10.0 million under term loans and the remaining amounts available for borrowing under this arrangement expired unused as of July 31, 2015. All amounts outstanding under the Credit Facility were due on October 1, 2018 and were collateralized by substantially all of the Company’s personal property, other than its intellectual property.

As of September 30, 2018, principal and interest due under the Credit Facility had been paid. A final payment equal to 3.48% of the amounts drawn under the Credit Facility was due upon the earlier of the maturity date, acceleration of the term loans or prepayment of all or part of the term loans. The final payment was accrued as additional interest expense using the effective-interest method from the date of issuance through the maturity date and recorded within other current liabilities. The final payment was made in October 2018.

The Company recognized $10 thousand and $0.1 million of interest expense related to the Credit Facility in the three-month periods ending September 30, 2018 and 2017, respectively. The Company recognized $0.1 million and $0.4 million of interest expense related to the Credit Facility in the nine-month periods ending September 30, 2018 and 2017, respectively.