Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Fair Value of Liabilities Measured on Recurring Basis) (Details)

v3.21.1
Fair Value Measurements (Fair Value of Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Change in fair value of convertible notes   $ (27)
Reclass partner company's warrants from liability to equity $ (1,216)  
Caelum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Liabilities, Beginning Balance 0 9,914
Change in fair value of convertible notes   (9,914)
Reclass partner company's warrants from liability to equity 0  
Liabilities, Ending Balance   0
Warrants [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Liabilities, Beginning Balance 27 991
Change in fair value of convertible notes   (27)
Reclass partner company's warrants from liability to equity (1,216)  
Liabilities, Ending Balance 0 27
Warrants [Member] | Caelum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Liabilities, Beginning Balance 0 991
Change in fair value of derivative liabilities   (991)
Liabilities, Ending Balance   0
Warrants [Member] | Cyprium [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Liabilities, Beginning Balance 27 0
Change in fair value of derivative liabilities 1,189 27
Reclass partner company's warrants from liability to equity (1,216)  
Liabilities, Ending Balance $ 0 $ 27