Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.20.2
Fair Value Measurements - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Measurement Input, Risk Free Interest Rate [Member] | Caelum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Values Assumptions Risk Free Return   0.12%  
Measurement Input Investments [Member] | Caelum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, Fair Value Disclosure $ 11.7 $ 11.7 $ 11.1
Fair Values Assumptions Expected Volatility Rate     70.00%
Fair Values Assumptions Risk Free Return     1.60%
Fair Values Assumptions Expected Discount For Lack Of Marketability     28.70%
Fair Values Assumptions Share Price     $ 1.54
Measurement Input, Share Price [Member] | Caelum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Values Assumptions Share Price   $ 1.62  
Measurement Input, Price Volatility [Member] | Caelum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Values Assumptions Expected Volatility Rate   70.00%  
Fair Values Assumptions Expected Discount For Lack Of Marketability   28.60%  
Caelum Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Proceeds from Cyprium Offering $ 8.0    
Caelum Warrant Liabilities [Member] | Measurement Input, Price Volatility [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Values Assumptions Expected Volatility Rate   85.00% 93.00%