Summary of Significant Accounting Policies - Schedule of Effect On Company's Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Notes payable, net of discount	$ 443		$ 1,285
Total current liabilities	987		1,832
Total liabilities	987		1,832
Accumulated deficit	(411,003)		(404,719)
Total stockholders' deficit	$ 2,962	$ (253)	(1,309)	$ 5,881	$ 9,870	$ 11,873
As Previously Reported [Member]
Notes payable, net of discount			1,851
Total current liabilities			2,398
Total liabilities			2,398
Accumulated deficit			(405,285)
Total stockholders' deficit			(1,875)
Adjustment [Member]
Notes payable, net of discount			(566)
Total current liabilities			(566)
Total liabilities			(566)
Accumulated deficit			566
Total stockholders' deficit			$ 566