Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.20.4
Commitments and Contingencies - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Commitments [Line Items]    
Operating lease, rent expense $ 898,000 $ 749,000
Amount of contingent liabilities payable 129,000  
Provision for contingent liabilities $ 0  
Milan office    
Other Commitments [Line Items]    
Operating lease, option to renew true  
Operating lease, renewal term 6 years