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Liquidity and Going Concern (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended
	Feb. 04, 2016	Dec. 18, 2015	Mar. 06, 2015	Feb. 28, 2014	Nov. 30, 2013	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Cash balances						$ 94	$ 8,381	$ 865	$ 5,570
Working capital deficit						10,100
Gross proceeds from direct offering	$ 800	$ 6,100	$ 6,100	$ 9,300
Net proceeds from sale of common stock						$ 1,193	$ 5,619
Convertible Secured Debt Facility [Member]
Debt maturity date					Dec. 31, 2016
Secured loan agreement					$ 8,000
April 4, 2016 [Member]
Number of shares sold by company during peirod						375,000
Sale of stock price per share						$ 2.17
Pre-funded warrants						200,000
Pre-funded warrants price per share						$ 2.16
Gross proceeds from direct offering						$ 1,250
June 30, 2016 [Member]
Cash balances								$ 100
ATM Sales Agreement [Member]
Number of shares sold by company during peirod						159,356
Net proceeds from sale of common stock						$ 300
Available for future sales						5,000
ATM Sales Agreement [Member] \| Maximum [Member]
Gross proceeds from direct offering						15,000
ATM Sales Agreement [Member] \| June 30, 2016 [Member]
Gross proceeds from direct offering						300
ATM Sales Agreement [Member] \| May 11, 2016 [Member]
Available for future sales						5,000
Common Stock Purchase Agreement [Member] \| End Of The Second Quarter 2016 [Member] \| Laramide Resources Ltd [Member]
Proceeds from sale properties						12,500
Payment for sale of properties						5,250
Common Stock Purchase Agreements [Member] \| April 8, 2016 [Member] \| Aspire Capital [Member]
Net proceeds from sale of common stock						$ 12,000
Agreement term						30 months
CSPA [Member]
Available for future sales						$ 12,000
Resource Capital Fund V LP [Member] \| Loan Agreement [Member]
Debt maturity date						Dec. 31, 2016