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 ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value Disclosures [Abstract]          
Fair value, assets, level 1 to level 2 transfers, amount $ 0 $ 0 $ 0 $ 0  
Fair value, assets, level 2 to level 1 transfers, amount 0 0 0 0  
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, transfers, net 0 $ 0 0 $ 0  
Available-for-sale securities $ 118,074,000   $ 118,074,000   $ 0