Commitment and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Nov. 30, 2020	Oct. 31, 2019	Mar. 31, 2021	Jan. 01, 2021	Mar. 31, 2019
Loss Contingencies [Line Items]
Lease liabilities			$ 2,065
Lease liabilities included in other current liabilities			1,855
Lease liabilities included in long-term operating lease liabilities			600
Operating lease costs			300
Cash paid for operating lease			$ 500
Weighted average discount rate			8.20%
Weighted-average remaining lease term			1 year 21 days
ASU No. 2016-02
Loss Contingencies [Line Items]
Right-of-use assets				$ 1,700
Lease liabilities				$ 2,500
South San Francisco, California
Loss Contingencies [Line Items]
Operating lease expiration date			May 31, 2022
Operating lease, renewal term			5 years
San Diego, California
Loss Contingencies [Line Items]
Operating lease, term of contract					13 months
Extend the lease term	December 2021	May 2021