Notes Payable (Schedule of Payment Due on Notes Payable) (Details) - Notes Payable - EWB Loan $ in Thousands	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Remainder of 2021	$ 431
2022	846
2023	6,617
2024	10,405
2025	4,210
Total payments due	22,509
Interest payments, loan discounts and financing costs	(2,836)
Current portion, less loan discounts and financing costs	0
Notes payable, net of current portion	$ 19,673

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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