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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following table provides information by level for liabilities that are measured at fair value using significant unobservable inputs (Level 3) (in thousands):
Warrant liability as of January 1, 2020$— 
Additions to warrant liability186 
Reclassification to equity(97)
Warrant liability as of December 31, 2020$89