Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property and Equipment [Abstract]

Property, Plant and Equipment

	Estimated Useful Lives		As of December 31,
	In Years		2017			2016
			(in thousands)
Computers and software	3-5		$	4,605		$	7,667
Furniture and fixtures	5-7		6,006			6,003
Laboratory equipment	3-7		3,423			3,423
Leasehold improvements	7-10		400			296
Buildings	15-40		59,212			59,212
Land		—	2,664			2,664
Total property and equipment			76,310			79,265
Less: Accumulated depreciation and amortization			(58,623		)	(59,875		)
Net property and equipment			$	17,687		$	19,390