Segment Reporting - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total net revenues	$ 933	$ 1,465
Total net loss	(13,040)	(25,573)
Regenerative Medicine [Member]
Segment Reporting Information [Line Items]
Total net revenues	428	297
Total net loss	(12,703)	(25,209)
Contract Services [Member]
Segment Reporting Information [Line Items]
Total net revenues	505	1,168
Total net loss	$ (337)	$ (364)