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Commitments (Details Textual) ft² in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 USD ($) ft² | Jul. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2014 USD ($) | Apr. 30, 2013 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Adjustable rent period | 2 years |  |  |  |  |  |  |
Tenant Improvements |  |  |  |  |  | $ 933,000 |  |
Rent expense, net |  |  |  |  |  | 1,600,000 | $ 1,300,000 | $ 1,200,000
Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Initial lease term |  |  |  | 11 years 6 months |  |  |  |
Security deposit |  |  |  | $ 49,000 |  |  |  |
Increase in monthly lease payments |  | $ 16,000 |  |  |  |  |  |
San Diego Office |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Initial lease term |  |  |  |  | 10 years |  |  |
Security deposit |  |  |  |  | $ 64,000 |  |  |
Tenant Improvements |  |  |  |  |  | 822,000 |  |
San Diego, California |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Area (square feet) | ft² | 51 |  |  |  |  |  |  |
Initial lease term | 10 years |  |  |  |  |  |  |
Security deposit | $ 95,000 |  |  |  |  |  |  |
Increase in monthly lease payments |  |  | $ 13,000 |  |  |  |  |
Tenant Improvements |  |  |  |  |  | $ 390,000 |  |
Minimum | Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease |  |  |  | 0 |  |  |  |
Minimum | San Diego Office |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease |  |  |  | 0 | 0 |  |  |
Maximum | Plymouth Meeting, Pennsylvania |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease |  |  |  | 58,000 |  |  |  |
Maximum | San Diego Office |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Monthly payments under the lease |  |  |  | $ 95,000 | $ 83,000 |  |  |

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