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Leases - Additional Information (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) ft² | Jun. 30, 2020 USD ($) ft² | Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease, term of contract | 10 years | 8 years | 10 years |  |
Operating leases, minimum lease payments | $ 90,300 | $ 10,100 | $ 90,300 | $ 13,391 |
Operating lease, option to extend | The lease is subject to two options to extend the lease term for a period of eight years each. | eight years |  |  |
Operating lease, existence of option to extend | true | true |  |  |
Operating lease, allowance for tenant improvements | $ 12,600 | $ 1,000 | $ 12,600 |  |
Operating lease, space delivered month and year |  |  | 2020-08 |  |
Operating lease, option to extend lease term | 8 years |  |  |  |
Operating lease, option to increase allowance for tenant improvements | $ 5,500 |  | $ 5,500 |  |
Weighted average remaining term | 6 years 2 months 12 days |  | 6 years 2 months 12 days |  |
Operating lease, incremental borrowing rate |  |  |  | 10.00% |
Weighted average discount rate | 7.30% |  | 7.30% |  |
Lease cost |  |  | $ 2,700 |  |
Short-term lease costs |  |  | 200 |  |
Right-of-use assets | $ 12,781 |  | 12,781 |  |
Operating lease, liabilities | 18,110 |  | 18,110 |  |
Short-term portion of operating lease liability | $ 2,867 |  | $ 2,867 |  |
Operating lease, liability, current, statement of financial position [extensible list] | us-gaap:OtherCurrentLiabilitiesMember |  | us-gaap:OtherCurrentLiabilitiesMember |  |
Operating lease liabilities, noncurrent | $ 15,243 |  | $ 15,243 |  |
Rent expense |  |  |  | $ 1,600 | $ 1,600
Operating lease Undiscounted amount | 4,153 |  | $ 4,153 |  |
Operating lease, lease not yet commenced, description |  |  | Total undiscounted future minimum lease payments do not include approximately $90.3 million related to the Company’s Brisbane lease that has not yet commenced. |  |
Operating lease, leases commence year |  |  | 2021 |  |
Minimum sublease rent income |  |  | $ 100 |  |
Operating lease, lease not yet commenced, existence of option to terminate |  |  | false |  |
Deposits for letters of credit | $ 200 |  | $ 200 |  |
Hayward, California |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Square feet of space leased | ft² |  | 36,303 |  |  |
Hayward, California | Executive Offices Research and Development and Business Operations |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Square feet of space leased | ft² | 136,293 |  | 136,293 |  |
Brisbane, California |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Square feet of space leased | ft² | 109,237 |  | 109,237 |  |
Operating lease expiration year |  |  | 2031 |  |
Operating lease commencement year |  |  | 2021 |  |
Operating lease Undiscounted amount | $ 90,300 |  | $ 90,300 |  |
Minimum |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease expiration year |  |  | 2025 |  |
Minimum | Hayward, California | Executive Offices Research and Development and Business Operations |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease expiration year |  |  | 2025 |  |
Maximum |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease expiration year |  |  | 2029 |  |
Operating lease, lease not yet commenced, term of contract | 10 years |  | 10 years |  |
Maximum | Hayward, California | Executive Offices Research and Development and Business Operations |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease expiration year |  |  | 2029 |  |

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