Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accumulated depreciation	$ 2,311	$ 1,919
Debt discount	$ 18,003	$ 18,003
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred shares outstanding (in shares)	8,000	8,000
Preferred shares issued (in shares)	8,000	8,000
Preferred stock, liquidation preference	$ 8,600	$ 8,264
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)	9,758,332	5,189,755
Common stock, shares outstanding (in shares)	9,758,332	5,189,755