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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) ft² | Mar. 31, 2019 | Jun. 30, 2019 USD ($) ft² renewal_option contract
Commitments And Contingencies [Line Items] |  |  |
Operating lease costs | $ | $ 1.6 |  | $ 2.8
Lease option to extend |  |  | true
Variable lease expense | $ | $ 0.4 |  | $ 0.6
Cash paid for operating lease liabilities included net cash used in operating activities | $ |  |  | $ 1.1
Operating lease, weighted-average remaining lease term | 9 years 3 months 18 days |  | 9 years 3 months 18 days
Operating lease, weighted-average discount rate | 6.90% |  | 6.90%
Richmond Lease | Office and Laboratory |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | 37,900 |  | 37,900
Richmond Lease | Operating Lease One | Research and Office Space |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | 7,700 |  | 7,700
Lease expiration date |  |  | Aug. 31, 2019
Valbonne Lease |  |  |
Commitments And Contingencies [Line Items] |  |  |
Additional property available under lease | contract |  |  | 2
Valbonne Lease | Operating Lease One | Research and Office Space |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | 14,036 |  | 14,036
Valbonne Lease | Operating Lease Two | Office Space |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | 6,800 |  | 6,800
Lease commencement date |  | Apr. 01, 2019 |
Richmond and Valbonne Leases |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease option to extend |  |  | Certain of these leases also include renewal options at the election of the Company to renew or extend the lease for an additional five to ten years.
Richmond and Valbonne Leases | Minimum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease agreement, extendable lease term | 5 years |  | 5 years
Richmond and Valbonne Leases | Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease agreement, extendable lease term | 10 years |  | 10 years
Brisbane Lease |  |  |
Commitments And Contingencies [Line Items] |  |  |
Remaining commencement, area of space leased (in sqft) | 52,620 |  | 52,620
Expected lease commencement period |  |  | 2019-06
Tenant improvement allowance | $ | $ 6.8 |  | $ 6.8
Lease not yet commenced, tenant improvement allowance | $ | $ 10.2 |  | $ 10.2
Number of lease term extension options | renewal_option |  |  | 2
Brisbane Lease | Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease agreement, extendable lease term | 5 years |  | 5 years
Brisbane Lease | Office and Laboratory |  |  |
Commitments And Contingencies [Line Items] |  |  |
Area of space leased (in sqft) | 87,700 |  | 87,700
Brisbane Lease | Office Space |  |  |
Commitments And Contingencies [Line Items] |  |  |
Commencement, area of space leased (in sqft) | 35,080 |  | 35,080
Lease commencement period |  |  | 2019-01

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