Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Accumulated depreciation	$ 1,919,000	$ 1,561,000
Debt discount	$ 18,003,000	$ 18,088,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	25,940,247	14,688,135
Common stock, shares outstanding (in shares)	25,940,247	14,688,135
Series A Convertible Preferred Stock
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred shares outstanding (in shares)	8,000	0
Preferred shares issued (in shares)	8,000	0
Preferred stock, liquidation preference	$ 8,264,000	$ 0