Stockholders' Equity (Deficit) (Details) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 16, 2015	Mar. 31, 2015	Dec. 31, 2013	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Sale of stock, price per share					$ 3.98
Warrant liability					$ 6,000	$ 5,826,000
Placement Agent [Member]
Class of Stock [Line Items]
Fees paid to placement agent	$ 833,000
Warrant liability	$ 814,000
Other expenses related to issuance of warrants				$ 213,000	218,000
Series March 2015 Warrants [Member]
Class of Stock [Line Items]
Number of securities called by warrants	393,939
Exercise price of warrants	$ 10.75
Decrease to additional paid-in capital resulting from warrants issued					$ 3,996,000
Private Placement [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction	1,575,758		1,440,140
Sale of stock, price per share	$ 8.25		$ 12.50
Proceeds from issuance of private placement, gross	$ 13,000,000	$ 13,000,000
Warrant liability	4,210,000
Other expenses related to issuance of warrants	$ 213,000
Private Placement [Member] | Placement Agent [Member]
Class of Stock [Line Items]
Number of securities called by warrants	94,545
Exercise price of warrants	$ 10.75
Private Placement [Member] | Series March 2015 Warrants [Member]
Class of Stock [Line Items]
Exercise price of warrants	$ 10.75
Warrant liability	$ 3,396,000