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Commitments - Narrative (Details) $ in Thousands	1 Months Ended					12 Months Ended
	Jun. 30, 2017 USD ($) ft²	Oct. 31, 2016 USD ($) ft²	Jun. 30, 2015 ft²	Mar. 31, 2014 USD ($) ft²	Apr. 30, 2013 ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 ft²	Jan. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Rent expense, net						$ 3,200	$ 2,400	$ 1,600
San Diego Office
Operating Leased Assets [Line Items]
Area (square feet) | ft²			31,207		26,500
Term of contract					10 years
Optional term extension of contract					5 years
Annual percentage increase in base rent						3.00%
Tenant Improvements										$ 3,400
San Diego, California
Operating Leased Assets [Line Items]
Area (square feet) | ft²		51,000
Term of contract		10 years
Annual percentage increase in base rent						3.00%
Tenant Improvements						$ 2,300
Security deposit		$ 95
Plymouth Meeting, Pennsylvania
Operating Leased Assets [Line Items]
Area (square feet) | ft²	57,361			20,858					27,583
Term of contract				11 years 6 months
Optional term extension of contract				5 years
Annual percentage increase in base rent						2.00%
Tenant Improvements						$ 2,600
Security deposit	$ 75			$ 49

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+ References

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-Name Accounting Standards Codification
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-Section 50
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The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

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Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

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