Quarterly report pursuant to Section 13 or 15(d)

Additional Cash Flow Information - Supplemental Disclosure of Cash Flow Information (Details)

v3.21.2
Additional Cash Flow Information - Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]        
Non-cash accruals of property, plant and equipment and other non-current assets $ 38,509 $ 7,955    
Non-cash settlement of withholding taxes associated with the 2019 bonus and vesting of certain awards 3,064 878    
Non-cash settlement of the 2019 bonus 5,430 4,344    
Non-cash settlement of Final Payment Fee 0 8,539    
Cash and cash equivalents 210,812 77,947 $ 78,297  
Non-current restricted cash 0 3,441 3,440  
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 210,812 $ 81,388 $ 81,738 $ 68,482