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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 41,512		$ 26,953
Less: accumulated depreciation and amortization	(22,828)		(24,882)
Property and equipment, net	18,684		2,071	[1]
Depreciation expense	500	$ 500
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	13,803		13,738
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,715		6,646
Laboratory equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,286		4,310
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	1,921		2,240
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 16,787		$ 19
[1] The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited financial statements as of that date.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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