Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Apr. 11, 2019	Apr. 09, 2019	Jan. 25, 2018	Dec. 31, 2019	Dec. 31, 2018	Feb. 13, 2020	Nov. 22, 2019
Class of Stock [Line Items]
Common stock, price per share			$ 1.35
Proceeds from offering			$ 11,900	$ 3,476	$ 12,172
Number of shares of common stock called by warrants			3,922,842
Warrants exercise price per share			$ 1.55
Number of shares of common stock called by each warrant			0.4
Offering close date				Jan. 29, 2018
Public offering of common shares, net of offering costs, shares			9,807,105
Registered Direct Offering [Member]
Class of Stock [Line Items]
Shares issued		4,000,000
Common stock, price per share	$ 0.49	$ 0.50
Proceeds from offering	$ 2,000	$ 2,000
Number of shares of common stock called by warrants	4,000,000
Warrants exercise price per share	$ 0.01
Concurrent Private Placement [Member]
Class of Stock [Line Items]
Common stock, price per share			$ 1.35
Proceeds from offering			$ 300
Number of shares of common stock called by warrants			81,487
Offering close date				Feb. 15, 2018
Public offering of common shares, net of offering costs, shares			203,708
ATM Offering [Member]
Class of Stock [Line Items]
Number of shares of common stock called by warrants							5,000,000
Warrants issued, value							$ 1,700
Commission rate							3.00%
Unregistered [Member]
Class of Stock [Line Items]
Number of shares of common stock called by warrants		3,000,000
Unregistered [Member] | Registered Direct Offering [Member]
Class of Stock [Line Items]
Number of shares of common stock called by warrants	3,000,000
Warrants exercise price per share	$ 0.78	$ 0.78
Period after issuance in which warrants are exercisable	6 months	9 months
Warrant term	5 years 6 months	5 years 6 months
Subsequent Event [Member] | ATM Offering [Member]
Class of Stock [Line Items]
Warrants issued, value						$ 2,500
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares designated				10,000	10,000
Preferred stock, liquidation preference				$ 5,659	$ 5,659
Preferred stock, conversion price per share				$ 0.75
Preferred stock, redemption price per share				$ 1,000
Preferred stock, shares issued				5,659	5,659
Preferred stock, shares outstanding				5,659	5,659