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Accounts Payable, Accrued Liabilities and Long-Term Liabilities - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accounts payable $ 15,975 $ 16,367
Accrued clinical expense 35,281 21,290
Accrued development and other expense 7,414 2,510
Accrued compensation and benefits 8,000 7,915
Total accounts payable and accrued liabilities $ 66,670 $ 48,082