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Commitments and Contingencies (Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2020 item | Jul. 22, 2015 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | May 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 01, 2019 USD ($) | Mar. 31, 2019 USD ($) | Oct. 31, 2015 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term restricted cash |  |  | $ 3,500,000 |  | $ 3,500,000 |  | $ 3,500,000 | $ 4,000,000 | $ 4,000,000.0 | $ 4,500,000 | $ 4,500,000
Rent payments |  |  | 1,800,000 |  | 5,400,000 |  |  |  |  |  |
Operating lease cost |  |  | 1,600,000 | $ 1,600,000 | 4,700,000 | $ 4,700,000 |  |  |  |  |
Additional liability associated with indemnification obligations |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
1305 O’Brien Drive, Menlo Park, California [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Renewal term |  |  | 5 years |  | 5 years |  |  |  |  |  |
Weighted average remaining lease term |  |  | 7 years 1 month 6 days |  | 7 years 1 month 6 days |  |  |  |  |  |
Weighted average discount rate |  |  | 7.90% |  | 7.90% |  |  |  |  |  |
PacBio IPR Petitions [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of petitions | item | 2 |  |  |  |  |  |  |  |  |  |
O’Brien Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease term |  | 132 months |  |  |  |  |  |  |  |  |
Rent expense first twelve months |  | $ 540,000 |  |  |  |  |  |  |  |  |
Rent expense last twelve months |  | $ 711,000 |  |  |  |  |  |  |  |  |
Period in which payment must be received without incurring late charge |  | 5 days |  |  |  |  |  |  |  |  |
Late charge, percent |  | 5.00% |  |  |  |  |  |  |  |  |
Amount not paid after written notice, bear interest from date due until date paid, period |  | 10 days |  |  |  |  |  |  |  |  |
O’Brien Lease Agreement [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |  |

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