Liquidity (Narrative) (Details) - USD ($)	1 Months Ended
	May 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and cash equivalents			$ 2,202,000	$ 5,711,000	$ 6,173,000	$ 9,370,000
Subsequent Event [Member]
Proceeds from issuance of common stock and warrants	$ 9,100,000
Scenario, Forecast [Member] | Australian Taxation Office [Member]
Expected tax rebate incentive payments		$ 1,800,000