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General - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jul. 26, 2017	Dec. 31, 2016	Jun. 06, 2016
Class Of Stock [Line Items]
Net loss	$ 1,943,000	$ 6,667,000	$ 13,276,000	$ 8,480,000
Net cash used in operating activities			8,137,000	6,968,000
Accumulated deficit	292,464,000		292,464,000			$ 279,188,000
Minimum stock split ratio			1,000
Senior Secured Convertible Notes [Member]
Class Of Stock [Line Items]
Debt instrument, principal face amount	$ 18,853,000	$ 35,000,000	$ 18,853,000	$ 35,000,000
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member]
Class Of Stock [Line Items]
Debt instrument, principal face amount							$ 35,000,000
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Cash in the restricted accounts					$ 11,800,000

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