Notes Payable	9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]
Notes Payable	6. Notes Payable Through April 15, 2019, the Company borrowed $15.0 million under the Loan Agreement by and among the Company, certain subsidiaries of the Company from time to time party thereto, the several banks and other financial institutions or entities from time to time parties thereto (collectively referred to as “Lender”) and Hercules, in its capacity as administrative agent and collateral agent for itself and Lender, and incurred $0.4 million of related debt discount and issuance costs, inclusive of the $0.3 million fee paid upon closing. Prior to the repayment of the debt, the debt discount and issuance costs were being accreted to the principal amount of debt and being amortized from the date of issuance through August 1, 2021 to interest expense using the effective-interest method. On April 15, 2019, the Company repaid in full all principal, accrued and unpaid interest, fees, costs and expenses under the Loan Agreement in an aggregate amount equal to $16.0 million (the “Payoff Amount”). The Payoff Amount includes a prepayment penalty of $0.2 million and a fee of $0.8 million, which were recorded to interest expense. The loss on extinguishment of the debt of approximately $1.0 million was recorded as interest expense during the second quarter of 2019. The loss on extinguishment represents the difference between the reacquisition price of the debt and the net carrying amount of the extinguished debt. In connection with the payment of the Payoff Amount, all liens and security interests granted to secure the obligations under the Loan Agreement and all guaranties of the obligations under the Loan Agreement terminated. No interest expense was associated with the Loan Agreement for the three months ended September 30, 2019. During the nine months ended September 30, 2019, the Company recognized $1.5 million of interest expense related to the Loan Agreement. No interest expense was associated with the Loan Agreement for the three and nine months ended September 30, 2018.

Notes Payable

9 Months Ended

Sep. 30, 2019

6. Notes Payable

Through April 15, 2019, the Company borrowed $15.0 million under the Loan Agreement by and among the Company, certain subsidiaries of the Company from time to time party thereto, the several banks and other financial institutions or entities from time to time parties thereto (collectively referred to as “Lender”) and Hercules, in its capacity as administrative agent and collateral agent for itself and Lender, and incurred $0.4 million of related debt discount and issuance costs, inclusive of the $0.3 million fee paid upon closing. Prior to the repayment of the debt, the debt discount and issuance costs were being accreted to the principal amount of debt and being amortized from the date of issuance through August 1, 2021 to interest expense using the effective-interest method.

On April 15, 2019, the Company repaid in full all principal, accrued and unpaid interest, fees, costs and expenses under the Loan Agreement in an aggregate amount equal to $16.0 million (the “Payoff Amount”). The Payoff Amount includes a prepayment penalty of $0.2 million and a fee of $0.8 million, which were recorded to interest expense. The loss on extinguishment of the debt of approximately $1.0 million was recorded as interest expense during the second quarter of 2019. The loss on extinguishment represents the difference between the reacquisition price of the debt and the net carrying amount of the extinguished debt. In connection with the payment of the Payoff Amount, all liens and security interests granted to secure the obligations under the Loan Agreement and all guaranties of the obligations under the Loan Agreement terminated.

No interest expense was associated with the Loan Agreement for the three months ended September 30, 2019. During the nine months ended September 30, 2019, the Company recognized $1.5 million of interest expense related to the Loan Agreement. No interest expense was associated with the Loan Agreement for the three and nine months ended September 30, 2018.