The Business - Narrative (Details) - USD ($) $ in Millions	May 18, 2017	Mar. 31, 2018	Oct. 31, 2017	Feb. 28, 2017
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Grants awarded		$ 8.6		$ 12.2
PCT Segment [Member] | Discontinued Operations [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Ownership interest (percent)	80.10%
PCT Segment [Member] | Discontinued Operations [Member] | Hitachi Chemical Co., LTD [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Purchase agreement, aggregate purchase price	$ 75.0
Purchase agreement, additional consideration	$ 4.4
Ischemic Repair CD34 Cell Technology [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Grants awarded			$ 1.9