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Accounts Payable, Accrued Liabilities and Long-Term Liabilities - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accounts payable $ 24,099 $ 16,367
Accrued clinical expense 22,920 21,290
Accrued development and other expense 4,743 2,510
Accrued compensation and benefits 5,081 7,915
Total accounts payable and accrued liabilities 56,843 48,082
Long-term liabilities $ 1,251 $ 999