Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operations
Revenues	$ 0	$ 0	$ 0
Operating Expenses
General and administrative expenses	34,551	7,300	7,109
Land option and lease expenses	981	596	584
Depreciation expense	106	100	80
Impairment loss on capital projects		506
Total operating expenses	35,638	8,502	7,773
Total operating loss	(35,638)	(8,502)	(7,773)
Other income (expense)
Interest income, net	343	82	24
Other expense	(31)	(19)	(15)
Total other income	312	63	9
Net loss	$ (35,326)	$ (8,439)	$ (7,764)
Net loss per common share - basic and diluted	$ (0.35)	$ (0.09)	$ (0.14)
Weighted average shares outstanding - basic and diluted	100,926	95,680	55,226
Comprehensive Loss
Net loss	$ (35,326)	$ (8,439)	$ (7,764)
Other comprehensive loss:
Change in fair value of investments	(13)	(27)
Comprehensive loss	$ (35,339)	$ (8,466)	$ (7,764)