Basis of Presentation, Liquidity and Summary of Significant Accounting Policies - Schedule of Biotime's Ownership of Outstanding Shares of its Subsidiaries (Details)	Mar. 31, 2019
Asterias Biotherapeutics, Inc. [Member] | United States [Member]
Noncontrolling Interest [Line Items]
BioTime Ownership	100.00%
Cell Cure Neurosciences, Ltd. [Member] | Israel
Noncontrolling Interest [Line Items]
BioTime Ownership	99.00%	[1]
ES Cell International Pte, Ltd. [Member] | Singapore
Noncontrolling Interest [Line Items]
BioTime Ownership	100.00%
OrthoCyte Corporation [Member] | United States [Member]
Noncontrolling Interest [Line Items]
BioTime Ownership	99.80%

[1] Includes shares owned by BioTime and ESI