Indebtedness	12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]
Indebtedness	Indebtedness Term Loan On March 1, 2016, the Company prepaid all outstanding amounts owed to SVB under the amended Loan Agreement. These obligations included the outstanding principal and interest of $13.8 million and a prepayment penalty of $0.2 million. In addition, the Company was required to pay a final payment equal to 6% of the amounts borrowed under the amended Loan Agreement, or $0.9 million, of which $0.4 million was accrued as of March 1, 2016. In addition, as a result of the prepayment, the Company wrote off the unamortized debt issuance costs and debt discount of $0.2 million. In connection with the prepayment, the Company recorded a loss on extinguishment of debt of $0.9 million, which is included in other income (expense) on the consolidated statements of operations and comprehensive income (loss) for the year ended December 31, 2016.

Indebtedness

12 Months Ended

Dec. 31, 2017

Term Loan

On March 1, 2016, the Company prepaid all outstanding amounts owed to SVB under the amended Loan Agreement. These obligations included the outstanding principal and interest of $13.8 million and a prepayment penalty of $0.2 million. In addition, the Company was required to pay a final payment equal to 6% of the amounts borrowed under the amended Loan Agreement, or $0.9 million, of which $0.4 million was accrued as of March 1, 2016. In addition, as a result of the prepayment, the Company wrote off the unamortized debt issuance costs and debt discount of $0.2 million. In connection with the prepayment, the Company recorded a loss on extinguishment of debt of $0.9 million, which is included in other income (expense) on the consolidated statements of operations and comprehensive income (loss) for the year ended December 31, 2016.