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Income taxes - Current income tax provision (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Current income tax provision:
Income tax benefit related to operating losses and research and development tax credits	$ 0	$ 0	$ 0	$ 0
Income tax benefits	$ 0		$ 0

X

- Definition

Amount of current income tax expense (benefit) directly related to operating loss carryforwards and certain tax credits.

+ References

No definition available.

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- References

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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