Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of changes in fair value of the Company's warrant liability measured at fair value using significant unobservable inputs (Level 3) (Details)

v3.20.4
Fair Value Measurements - Summary of changes in fair value of the Company's warrant liability measured at fair value using significant unobservable inputs (Level 3) (Details) - Warrant [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Beginning balance $ 24 $ 210
Additions 0 18
Change in fair value (16) (204)
Ending balance $ 8 $ 24