Note Payable - Carrying Value (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Note payable net of discount, long-term	$ 9,400		$ 9,400
Loan and Security Agreement, Term Loans
Debt Instrument [Line Items]
Note payable, including End of Term Charge	10,695		10,695
Debt discount, net of accretion	(1,295)		(1,295)
Note payable net of discount, long-term	9,400		9,400
Interest expense	$ 100	$ 0	$ 100	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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-Publisher FASB
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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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