Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accounts payable	[1]	$ 2,778	$ 2,359
Accrued compensation	[2]	1,970	2,456
Accrued liabilities	[3]	2,035	1,639
Other current liabilities		76	9
Total		$ 6,859	$ 6,463

[1] Includes $0.8 million of transaction costs related to the Asterias Merger (see Note 3) recorded outside of the business combination.

[2] Includes $0.3 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 $0.3 million of transaction costs related to the Asterias Merger (see Note 3) recorded outside of the business combination.