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Leases - Additional Information (Detail) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) ft² | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Lessee Lease Description [Line Items] |  |  |  |
Operating lease liabilities | $ 10,268,000 | $ 0 |  |
Operating lease right-of-use assets | $ 9,959,000 | 0 |  |
Operating lease, description | The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 0.6 year to 6.3 years, one of which includes an option to extend the lease for one five-year term. |  |  |
Operating lease, option to extend | true |  |  |
Operating lease, options to extend | one of which includes an option to extend the lease for one five-year term. |  |  |
Operating lease, renewal term | 5 years |  |  |
weighted average remaining lease term | 4 years 8 months 12 days |  |  |
Weighted average discount rate | 8.00% |  |  |
Restricted cash | $ 4,787,000 | $ 4,826,000 | $ 3,111,000 | $ 2,475,000
Corporate Office Space Lease Agreement |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Operating leases arrangement term |  | 10 years 9 months |  |
Corporate Office Space Lease Agreement | Letter of Credit |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Restricted cash | $ 2,200,000 |  |  |
California | Corporate Office Space Lease Agreement |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Office space leases in square feet | ft² |  | 67,020 |  |
Minimum lease payment amount |  | $ 53,700,000 |  |
Lease commencement period | first half of fiscal year 2020 |  |  |
Minimum [Member] |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Operating lease remaining lease term | 7 months 6 days |  |  |
Maximum |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Operating lease remaining lease term | 6 years 3 months 18 days |  |  |

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- Definition Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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