Warrants (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		29 Months Ended
	Aug. 21, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Nov. 14, 2014
Class of Warrant or Right [Line Items]
Proceeds from warrant exercises, net		$ 0	$ 3,233,000	$ 9,782,000
Class A Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants issued	2,200,000
Number of common stock to be purchased by warrants	2,200,000				1
Exercise date	Aug. 16, 2018
Shares covered by each warrant	1
Exercise price	$ 2.75				$ 2.75
Class B Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants issued	2,200,000
Number of common stock to be purchased by warrants	1,100,000
Exercise date	May 16, 2014
Shares covered by each warrant	2
Exercise price	$ 2.50
Underwriters [Member] | Class A Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants issued	330,000
Number of common stock to be purchased by warrants	330,000
Underwriters [Member] | Class B Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants issued	330,000
Number of common stock to be purchased by warrants	165,000
Underwriters [Member] | Representative Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants issued	154,000
Number of common stock to be purchased by warrants	154,000
Exercise price	$ 3.125
Underwriters [Member] | Representative Warrants [Member] | Minimum [Member]
Class of Warrant or Right [Line Items]
Exercise date	May 16, 2014
Underwriters [Member] | Representative Warrants [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Exercise date	Aug. 16, 2018