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Commitments and Contingencies - Narrative (Details) ft² in Thousands		1 Months Ended					3 Months Ended
	Oct. 01, 2017 USD ($)	Jun. 30, 2017 USD ($)	Oct. 31, 2016 USD ($) ft²	Jan. 31, 2016 USD ($)	Mar. 31, 2014 USD ($)	Apr. 30, 2013	Mar. 31, 2018 USD ($)	Mar. 31, 2016 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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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.

+ 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
-Topic 944
-SubTopic 210
-Section S99
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