Leases - Operating Lease Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) ft² term	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)
Leases [Line Items]
Operating lease right-of-use assets recognized in exchange for lease liabilities	$ 2,133	$ 57,691	$ 0
Mission Bay Lease
Leases [Line Items]
Leased space delivered (in sq ft) | ft²	4,940	13,907
Operating lease right-of-use assets recognized in exchange for lease liabilities	$ 2,133	$ 6,698
Number of consecutive terms to extend lease | term	2
Lease extension term	5 years
Third Street Lease
Leases [Line Items]
Leased space delivered (in sq ft) | ft²	0	67,105
Operating lease right-of-use assets recognized in exchange for lease liabilities	$ 0	$ 50,993
Number of consecutive terms to extend lease | term	1
Lease extension term	5 years