Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.20.2
Fair Value Measurements - Additional Information (Details) - Caelum [Member]
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
Measurement Input, Risk Free Interest Rate [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Values Assumptions Risk Free Return 1.60%
Measurement Input Investments [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Investments, Fair Value Disclosure | $ $ 11.1
Measurement Input, Share Price [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Values Assumptions Share Price | $ / shares $ 1.543
Measurement Input, Price Volatility [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 28.70%