Summary of Convertible notes payable (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Convertible notes due 2022	$ 13,689	$ 13,689
Unamortized debt discount / debt issuance costs	(20)	(4,112)
Less principal payments	(13,661)
Less principal payments	13,661
Less current portion of long-term debt	(4)	(2,431)
Convertible debt, long-term, net of discount and issuance costs	$ 4	$ 7,146

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Cash payments for and related to principal collection on loans related to operating activities.

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