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Commitments and Contingencies - Leases (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 14, 2018 ft² item | Jan. 01, 2017 USD ($) | Dec. 31, 2018 USD ($) ft² item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases |  |  |  |  |
Rent expense |  |  | $ 1,600,000 | $ 1,500,000 | $ 1,100,000
Future minimum lease payments under noncancelable operating leases |  |  |  |  |
2019 |  |  | 1,719,000 |  |
2020 |  |  | 2,929,000 |  |
2021 |  |  | 6,376,000 |  |
2022 |  |  | 6,496,000 |  |
2023 |  |  | 6,842,000 |  |
Thereafter |  |  | 50,005,000 |  |
Total future minimum payments |  |  | 74,367,000 |  |
Loss contingency accrual |  |  |  |  |
Accrual for loss contingency |  |  | 0 |  |
Purchase commitments |  |  |  |  |
Purchase commitment due after one year |  |  | 3,400,000 |  |
Facilities Leases |  |  |  |  |
Operating Leases |  |  |  |  |
Deferred rent |  |  | $ 500,000 | $ 300,000 |
Domestic Office Leases |  |  |  |  |
Operating Leases |  |  |  |  |
The number of adjacent facilities rented | item |  |  | 2 |  |
Extended lease term |  |  | 3 years |  |
Number of lease renewal periods | item |  |  | 1 |  |
Optional lease extension term |  |  | 3 years |  |
Area of leased space | ft² |  |  | 98,000 |  |
Domestic Office Leases | Maximum |  |  |  |  |
Operating Leases |  |  |  |  |
Tenant improvement allowance |  | $ 300,000 |  |  |
Foreign Subsidiaries Office Leases |  |  |  |  |
Operating Leases |  |  |  |  |
Area of leased space | ft² |  |  | 14,000 |  |
Aliso Facility |  |  |  |  |
Operating Leases |  |  |  |  |
Number of properties leased | item | 1 |  |  |  |
Number of buildings leased | item | 3 |  |  |  |
Number of lease renewal periods | item | 2 |  |  |  |
Optional lease extension term | 5 years |  |  |  |
Area of leased space | ft² | 160,000 |  |  |  |
Term of lease | 13 years |  |  |  |

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- Definition The amount of tenant improvement allowance under the operating lease. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing after one year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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