Long Term Debt And Convertible Notes - Oxford Finance Loan Narrative (Details) - USD ($) $ in Thousands			5 Months Ended	12 Months Ended
	Oct. 05, 2020	Feb. 20, 2020	Dec. 31, 2014	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2014
Debt Instrument [Line Items]
Payments of debt fees				$ 0	$ 1,875
Interest expense on deferred financing and debt issuance costs, less than				$ 106	968
Medium-term Notes | Oxford Finance Loan
Debt Instrument [Line Items]
Debt instrument, face amount including accordion feature						$ 20,000
Proceeds from issuance of debt			$ 15,000
Stated interest rate						8.96%
Debt term			5 years
Interest payments term			36 months
Principal and interest payments term			24 months
Final payment, percentage of loan amount due						8.50%
Contingent fee amount, maximum						$ 2,500
Payments of debt fees	$ 1,900
Repayments on term loan obligations		$ 17,300
Extinguishment of debt		15,000
Final payment on loan		1,300
Fee amount		900
Accrued interest		100
Loss on extinguishment of debt		$ 400
Interest expense on deferred financing and debt issuance costs, less than					100
Interest expense					$ 400