Prior Period Financial Statement Revision - Schedule of Consolidated Financial Statements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Total liabilities	$ 18,523,000	$ 20,147,000
Stockholders' equity before accumulated deficit		236,151,000
Accumulated deficit	(234,525,000)	(219,652,000)
Total liabilities and stockholders' equity	28,813,000	36,646,000
Net loss for the year ended	$ (14,873,000)	(10,353,000)
Previously Reported [Member]
Total liabilities		19,019,000
Stockholders' equity before accumulated deficit		237,472,000
Accumulated deficit		(219,845,000)
Total liabilities and stockholders' equity		36,646,000
Net loss for the year ended		(10,546,000)
Restatement Adjustment [Member]
Total liabilities		1,128,000
Stockholders' equity before accumulated deficit		(1,321,000)
Accumulated deficit		193,000
Total liabilities and stockholders' equity
Net loss for the year ended		$ 193,000