The Business - CLBS03 (Details) $ in Millions		12 Months Ended
	Feb. 23, 2017 USD ($)	Dec. 31, 2016 cohort	Mar. 16, 2017	Mar. 11, 2016
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Subsidiary, Ownership Interest by Parent				80.10%
Interim efficacy analysis, percentage threshold		50.00%
Interim efficacy analysis, follow-up milestone period		6 months
The Sanford Project: T-Rex Study [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Number of cohorts (cohort) | cohort		2
Subsequent Event [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Subsidiary, Ownership Interest by Parent			80.10%
Proceeds Awarded From Strategic Collaboration to Support Study	$ 12.2
Grants Receivable, Current	$ 5.7