Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Summary of Lease Exit Accruals (Details)

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Commitments and Contingencies - Summary of Lease Exit Accruals (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Beginning balance $ 4,634,000    
Lease exit expense (4,634,000) $ 1,400,000 $ 300,000
Ending balance $ 0 $ 4,634,000