Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid expense and other current assets
Warrants to purchase equity securities	$ 3,816	$ 554
Prepaid research and development contracts	1,674	1,999
Other current assets	1,575	1,398
Prepaid insurance	1,459	203
Accrued interest receivable	95	476
Total	$ 8,619	$ 4,630

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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- Definition

Amount of current assets classified as other.

+ References

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

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No definition available.

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- Definition

Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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- Definition

Represents the amount of prepaid research and development contracts.

+ References

No definition available.

+ Details

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- Definition

Amount of warrants outstanding that are convertible in to equity securities.

+ References

No definition available.

+ Details

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