Stockholders' Equity (Deficit) (Details) - USD ($)		3 Months Ended	9 Months Ended
	Mar. 16, 2015	Mar. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Sale of stock, price per share			$ 3.95		$ 12.50
Proceeds from issuance of private placement, gross		$ 13,000,000
Number of securities called by warrants	393,939
Exercise price of warrants	$ 10.75
Warrant liability			$ 10,000	$ 5,826,000
Decrease to additional paid-in capital resulting from warrants issued		(3,998,000)
Other expenses related to issuance of warrants		$ 213,000	213,000
Placement Agent [Member]
Class of Stock [Line Items]
Number of securities called by warrants	94,548				86,408
Exercise price of warrants	$ 10.750				$ 12.50
Fees paid to placement agent	$ 833,000
Warrant liability	$ 814,000
Other expenses related to issuance of warrants			$ 218,000
Private Placement [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction	1,575,758
Sale of stock, price per share	$ 8.250
Proceeds from issuance of private placement, gross	$ 13,000,000
Number of securities called by warrants	393,948
Exercise price of warrants	$ 10.750
Warrant liability	$ 4,210,000