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Commitments and Contingencies - Narrative (Details) ft² in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) | Jun. 30, 2017 USD ($) | Oct. 31, 2016 USD ($) ft² | Jan. 31, 2016 USD ($) | Mar. 31, 2014 USD ($) | Apr. 30, 2013 | Mar. 31, 2016 USD ($) | Sep. 30, 2018 USD ($)
San Diego Office |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Initial lease term |  |  |  |  |  | 10 years |  |
Tenant improvements |  |  |  |  |  |  |  | $ 3,400,000
San Diego, California |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Initial lease term |  |  | 10 years |  |  |  |  |
Tenant improvements |  |  |  |  |  |  |  | 2,300,000
Area leased (in square feet) | ft² |  |  | 51 |  |  |  |  |
Adjustable rent period |  |  | 2 years |  |  |  |  |
Security deposit |  |  | $ 95,000 |  |  |  |  |
Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Initial lease term |  |  |  |  | 11 years 6 months |  |  |
Tenant improvements |  |  |  |  |  |  |  | 2,600,000
Security deposit |  | $ 75,000 |  |  | $ 49,000 |  |  |
Minimum | San Diego Office |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Increase to monthly payment |  |  |  | $ 0 |  |  |  |
Minimum | San Diego, California |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease |  |  | 0 |  |  |  |  |
Minimum | Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease | $ 75,000 |  |  |  | 0 |  | $ 0 |
Additional amendment, periodic payments |  | 173,000 |  |  |  |  |  | 0
Maximum | San Diego Office |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Increase to monthly payment |  |  |  | $ 99,000 |  |  |  |
Maximum | San Diego, California |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease |  |  | $ 95,000 |  |  |  |  |
Maximum | Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease | $ 90,000 |  |  |  | $ 58,000 |  | $ 80,000 |
Additional amendment, periodic payments |  | $ 179,000 |  |  |  |  |  | $ 179,000

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