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Commitments and Contingencies - Narrative (Details) ft² in Thousands	1 Months Ended				3 Months Ended
	Jun. 30, 2017 USD ($) ft²	Oct. 31, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)
San Diego, California [Member]
Loss Contingencies [Line Items]
Tenant improvements						$ 2,200,000
Area leased (in square feet) | ft²		51
Initial lease term		10 years
Adjustable rent period		2 years
Security deposit		$ 95,000
Plymouth Meeting, Pennsylvania [Member]
Loss Contingencies [Line Items]
Tenant improvements	$ 1,400,000
Area leased (in square feet) | ft²	30
Initial lease term				11 years 6 months
Security deposit	$ 75,000			$ 49,000
Minimum [Member] | San Diego Office [Member]
Loss Contingencies [Line Items]
Increase to monthly payment			$ 0
Tenant improvements						$ 822,000
Minimum [Member] | San Diego, California [Member]
Loss Contingencies [Line Items]
Monthly payments under the lease		0
Minimum [Member] | Plymouth Meeting, Pennsylvania [Member]
Loss Contingencies [Line Items]
Increase to monthly payment					$ 0
Monthly payments under the lease	75,000			0
Lease, Second Amendment, Periodic Payments, Amount	173,000
Maximum [Member] | San Diego Office [Member]
Loss Contingencies [Line Items]
Increase to monthly payment			$ 99,000
Maximum [Member] | San Diego, California [Member]
Loss Contingencies [Line Items]
Monthly payments under the lease		$ 95,000
Maximum [Member] | Plymouth Meeting, Pennsylvania [Member]
Loss Contingencies [Line Items]
Increase to monthly payment					$ 80,000
Monthly payments under the lease	90,000			$ 58,000
Lease, Second Amendment, Periodic Payments, Amount	$ 179,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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