Supplemental Cash Flow Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash paid during the period for:
Interest	$ 1,875	$ 336
Non-cash transactions:
Accounts payable and accrued liabilities	82	(71)
Non-cash acquisition of Carbon California interests		(18,906)
Carbon California Acquisition on February 1, 2018		17,114
Exercise of warrant derivative		$ (1,792)
Old Ironsides Notes interest paid-in-kind	$ 594