Stockholders' Equity (Details) - USD ($)						6 Months Ended
	Mar. 22, 2018	Jan. 12, 2018	Sep. 19, 2017	Jun. 27, 2017	May 10, 2017	Jun. 30, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction	2,743,640	4,000,000
Sale of stock, price per share	$ 1.10	$ 1.00
Proceeds from equity offerings, gross	$ 3,000,000	$ 4,000,000
Exercise price of warrants						$ 2.78
Proceeds from exercises of warrants						$ 198,000
Net proceeds from issuance of common stock and warrants	$ 2,800,000	$ 3,400,000
Derivative liability						185,000	$ 292,000
Changes in estimated fair value						$ 77,000
Warrants expired during the period						17,523
November 2016 Warrants [Member]
Class of Stock [Line Items]
Warrants exercised during period						217,400
Proceeds from exercises of warrants						$ 198,000
Derivative liability						157,000	$ 260,000
Changes in estimated fair value						81,000
Common Stock Issuance Agreement [Member]
Class of Stock [Line Items]
Capital raised limit for Price Protection Obligation						$ 10,000,000
Shares issued per agreements				28,684
CSIA Second Issuance [Member]
Class of Stock [Line Items]
Shares issued per agreements			523,210
Public Offering of Warrants and Common Stock [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction					2,584,085
Net proceeds from issuance of common stock and warrants					$ 9,400,000
Offering costs					$ 1,200,000
Public Offering of Warrants and Common Stock [Member] | Pre-Funded Warrant [Member]
Class of Stock [Line Items]
Number of securities called by warrants					4,483,334
Number of shares called by each warrant					1
Sale of stock, price per share					$ 1.49
Exercise price of warrants					$ 0.01
Public Offering of Warrants and Common Stock [Member] | Common Warrant [Member]
Class of Stock [Line Items]
Number of securities called by warrants					8,000,000
Sale of stock, price per share					$ 1.50
Exercise price of warrants					$ 1.50
Expiration term of warrants (in years)					5 years