Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Fair Value Measurement Hierarchy of Derivative Liability (Details)

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Fair Value Measurements - Schedule of Fair Value Measurement Hierarchy of Derivative Liability (Details) - Common Stock Warrants [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Beginning balance $ (1,238) $ (220)
Issuance of derivatives   (6,328)
Change in fair value (242) 4,166
Exercise of warrants 195 1,556
Ending balance $ (1,285) $ (826)