Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Debt (Details)

v3.21.1
Fair Value Measurements - Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Carrying Amount    
Fair Value Measurements    
Long-term debt $ 18,855 $ 20,852
Carrying Amount | Silicon Valley Bank Loans    
Fair Value Measurements    
Long-term debt 9,762 11,759
Carrying Amount | Novartis Note    
Fair Value Measurements    
Long-term debt 9,093 9,093
Fair Value    
Fair Value Measurements    
Long-term debt 18,844 20,802
Fair Value | Silicon Valley Bank Loans    
Fair Value Measurements    
Long-term debt 9,752 11,747
Fair Value | Novartis Note    
Fair Value Measurements    
Long-term debt $ 9,092 $ 9,055