Acquisitions and Strategic Agreements - Montefiore (Details) (Montefiore Medical Center, USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended
	Oct. 25, 2013	Apr. 30, 2015	Jan. 31, 2015
Montefiore Medical Center
Business Acquisition [Line Items]
Proprietary lease term	15 years
Cash paid	$ 3,000
Periodic royalty payment, term	6 years 6 months
Royalty liability		$ 2,404	$ 2,386