Stockholders' Equity (Deficit) (Details) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 03, 2016	Mar. 16, 2015	May 31, 2016	Jun. 30, 2016	Mar. 31, 2015	Jun. 30, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Exercise price of warrants				$ 5.87		$ 5.87	$ 8.19
Value of common stock issued in offering						$ 2,634,000	$ 8,266,000
Warrant liability							6,000
Other expenses related to issuance of warrants					$ 213,000
Decrease to additional paid-in capital resulting from warrants issued					(3,996,000)
June 2016 Offering Liability [Member]
Class of Stock [Line Items]
Creation of dilutive financing derivative						1,816,000
Dividend yield	0.00%			0.00%
Volatility	123.00%			122.00%
Risk-free interest rate	1.23%			1.01%
Changes in estimated fair value						(506,000)
Warrant liability				$ 1,310,000		1,310,000
Common Stock [Member]
Class of Stock [Line Items]
Value of common stock issued in offering						$ 21,000	$ 16,000
Placement Agent [Member]
Class of Stock [Line Items]
Number of securities called by warrants		94,545
Exercise price of warrants		$ 10.75
Fees paid to placement agent		$ 833,000
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		$ 8.25
Number of securities called by warrants		393,939
Exercise price of warrants		$ 10.75
Proceeds from Issuance of Private Placement		$ 13,000,000
Warrant liability		$ 4,210,000
Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction			2,127,660
Sale of stock, price per share			$ 2.35
Proceeds from issuance of common stock and warrants	$ 5,000,000
Number of securities called by warrants			1,063,830
Number of shares called by each warrant			0.50
Exercise price of warrants			$ 2.25
Warrant expiration term			5 years
Proceeds from issuance of stock and warrants, net of offering costs			$ 4,200,000
Placement agent fee as percentage of total gross proceeds of offering			7.00%
Fees paid to placement agent			$ 75,000
Value of common stock issued in offering			3,200,000
Stock issuance costs			800,000
Issuance costs allocable to warrants			$ 200,000