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Certain Balance Sheet Items - Accrued Expenses (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Operating Lease, Accretion Of Liability $ 800,000 $ 0
Summary of Accrued Expenses    
Accrued outsourced research and development 8,423,000 21,921,000
Accrued compensation and payroll taxes 27,888,000 16,604,000
Accrued outsourced manufacturing expenses 9,173,000 3,975,000
Other accrued expenses 7,876,000 7,623,000
Operating Lease, Liability 6,469,000 0
Total accrued expenses 59,829,000 50,123,000
Accrued Liabilities, Noncurrent 4,180,000 594,000
Total accrued expenses, current 55,649,000 49,529,000
Operating Lease, Cost 2,600,000 2,400,000
Operating Lease, Payments $ 3,100,000 $ 2,400,000