Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operations
Revenues	$ 0	$ 0	$ 0	$ 0
Operating Expenses
General and administrative expenses	3,318	2,227	19,319	4,382
Land option and lease expenses	250	247	500	483
Depreciation expense	48	26	77	52
Total operating expenses	3,616	2,500	19,896	4,917
Total operating loss	(3,616)	(2,500)	(19,896)	(4,917)
Other income (expense)
Interest income, net	131	49	253	86
Other	3	(10)	(39)	(18)
Total other income	134	39	214	68
Net loss	$ (3,482)	$ (2,461)	$ (19,682)	$ (4,849)
Net loss per common share - basic and diluted	$ (0.03)	$ (0.03)	$ (0.18)	$ (0.05)
Weighted average shares outstanding - basic and diluted	106,398	97,723	106,393	96,712
Comprehensive Loss
Net loss	$ (3,482)	$ (2,461)	$ (19,682)	$ (4,849)
Other comprehensive loss:
Change in fair value of investments		(2)		3
Comprehensive loss	$ (3,482)	$ (2,463)	$ (19,682)	$ (4,846)