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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Liabilities measured at fair value by level The following table summarizes the Company’s liabilities measured at fair value as of December 31, 2020 and 2019, by level within the fair value hierarchy (in thousands):
Level 1Level 2Level 3
December 31, 2020
Promissory note$— $— $15,392 
December 31, 2019
Promissory note$— $— $16,169 
Changes in fair value of promissory notes
The following table includes the changes in fair value of the promissory note which are Level 3 on the fair value hierarchy (in thousands):
20202019
Fair value at January 1,$16,169 $15,852 
Interest expense accrued150 150 
(Decrease) increase in fair value(927)167 
Fair value at December 31,$15,392 $16,169