Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accounts payable	[1]	$ 1,379	$ 2,359
Accrued compensation	[2]	3,457	2,456
Accrued liabilities	[3]	2,476	1,639
Other current liabilities		24	9
Total		$ 7,336	$ 6,463

[1] Includes $0.1 million of transaction costs related to the Asterias Merger (see Note 3) recorded outside of the business combination.

[2] Includes $2.0 million of change of control and related transaction costs related to the Asterias Merger (see Note 3) recorded outside of the business combination.

[3] Includes $0.6 million of transaction costs related to the Asterias Merger (see Note 3) recorded outside of the business combination.