Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee Lease Description [Line Items]
Non-cancelable operating sublease, expiration date for initial leased space		2025-01
Non-cancelable operating sublease, expiration date for expansion space leased		2022-12
Lessee, Operating Sublease, Existence of Option to Extend [true false]		true
Lessee, operating sublease, option to extend		options to extend for the entire premises through October 2028
Operating sublease, annual increase percentage for base rent		3.00%
Monthly base rent for permanent space	$ 63,425
Monthly base rent for temporary space	$ 28,745
Option to extend lease term of permanent space	12 months
Annual increase percentage for lease charges	3.00%
Weighted average discount rate, operating leases		7.00%
Weighted average remaining lease term		4 years
Cash paid for operating lease liabilities		$ 3,000,000
Rent expense		$ 3,100,000	$ 1,500,000	$ 0
San Diego, California
Lessee Lease Description [Line Items]
Lease commencement date for permanent space	May 01, 2020
Lease expiration date for permanent space	Dec. 31, 2021
Lease commencement date for temporary space	Jan. 01, 2020