Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	50,000,000
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	8,271,895	4,997,544
Common stock, shares outstanding	8,271,503	4,997,152
Treasury stock, shares	392	392
Series A Preferred Stock
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,750,000	2,750,000
Preferred stock, shares issued	2,750,000	2,750,000
Preferred stock, shares outstanding	2,750,000	2,750,000
Preferred stock liquidation preference	$ 33,051	$ 31,411
Series B Preferred Stock
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued	17,123,284	0
Preferred stock, shares outstanding	17,123,284	0
Preferred stock liquidation preference	$ 25,006	$ 0