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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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-Name Accounting Standards Codification
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