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Note 2 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands	Jul. 26, 2023	Jun. 30, 2023	Dec. 31, 2022
Retained Earnings (Accumulated Deficit)		$ (631,453)	$ (577,104)
Subsequent Event [Member]
Proceeds from Issuance of Private Placement	$ 120,000

X

- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

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X

- Definition

Amount of accumulated undistributed earnings (deficit).

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