Subsequent Events - Narrative (Details)		1 Months Ended	12 Months Ended
	Mar. 08, 2019 USD ($) day shares	Feb. 28, 2019 shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Series B Preferred Stock
Subsequent Event [Line Items]
Preferred stock, shares issued (in shares)			75	450
Preferred stock, shares outstanding (in shares)			75	450
Preferred stock, stated value | $			$ 1,000	$ 1,000
Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock, shares issued (in shares)			525	525
Preferred stock, shares outstanding (in shares)			525	525
Preferred stock, stated value | $			$ 1,000	$ 1,000
Preferred Stock | Series B Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)			375	2,350
Preferred Stock | Series C Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)			1,225
Common Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)			5,423,000	8,393,000
Common Stock | Series B Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)			1,339,286	8,392,857
Common Stock | Series C Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)			4,083,333
Subsequent Event
Subsequent Event [Line Items]
Reverse stock split	0.10
Reverse stock split, effective date, number of calendar days, if circumstances met (not sooner than) | day	20
Subsequent Event | Series B Preferred Stock
Subsequent Event [Line Items]
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)	0
Subsequent Event | Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock, shares issued (in shares)	475
Preferred stock, shares outstanding (in shares)	475
Preferred stock, stated value | $	$ 475,000
Subsequent Event | Preferred Stock | Series B Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)		75
Subsequent Event | Preferred Stock | Series C Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)		50
Subsequent Event | Common Stock | Series B Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)		267,857
Subsequent Event | Common Stock | Series C Preferred Stock
Subsequent Event [Line Items]
Conversion of convertible preferred stock, shares (in shares)		166,667