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Commitments - Narrative (Details) ft² in Thousands, $ in Thousands	1 Months Ended					3 Months Ended	12 Months Ended			13 Months Ended
	Jun. 30, 2017 USD ($)	Oct. 31, 2016 USD ($) ft²	Jan. 31, 2016 USD ($)	Mar. 31, 2014 USD ($)	Apr. 30, 2013	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2017 USD ($) ft²
Operating Leased Assets [Line Items]
Rent expense, net							$ 2,400	$ 1,600	$ 1,300
San Diego Office
Operating Leased Assets [Line Items]
Term of contract					10 years
Tenant Improvements			$ 822
San Diego, California
Operating Leased Assets [Line Items]
Term of contract		10 years
Tenant Improvements							$ 2,300
Area (square feet) | ft²		51
Adjustable rent period		2 years
Security deposit		$ 95
Plymouth Meeting, Pennsylvania
Operating Leased Assets [Line Items]
Term of contract				11 years 6 months
Tenant Improvements	$ 2,600									$ 2,600
Area (square feet) | ft²										30
Security deposit	75			$ 49						$ 75
Minimum | Plymouth Meeting, Pennsylvania
Operating Leased Assets [Line Items]
Monthly payments under the lease										75
Lease amendment, periodic payments, amount	173
Maximum | San Diego Office
Operating Leased Assets [Line Items]
Monthly payments under the lease			$ 99
Maximum | San Diego, California
Operating Leased Assets [Line Items]
Monthly payments under the lease		$ 95
Maximum | Plymouth Meeting, Pennsylvania
Operating Leased Assets [Line Items]
Monthly payments under the lease				$ 58						$ 90
Increase in monthly lease payments						$ 80
Lease amendment, periodic payments, amount	$ 179

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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