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Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Less: Accumulated amortization $ (1,907) $ (1,670)
Net amount 1,082 1,311
Healthspan Research LLC Acquisition    
Gross carrying amount $ 1,346 1,346
Remaining weighted average period 10 years  
License Agreements and Other | Minimum    
Gross carrying amount $ 1,643 $ 1,635
Remaining weighted average period 9 years