Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Oct. 24, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Shares authorized (in shares) (up to)		7,500		7,500
Shares issued (in shares)		32		32
Shares outstanding (in shares)		32		32
Stated value (in dollars per share)		$ 0.0001		$ 0.0001
Accrued dividends		$ 56		$ 47
Conversion price below this fair value of the common stock (in dollars per share)		$ 1.16
Series B-1 Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares) (up to)		100
Shares issued (in shares)		0
Shares outstanding (in shares)		0
Series B-1 Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Shares authorized (in shares) (up to)			2,800
Shares issued (in shares)			2,800
Stated value (in dollars per share)			$ 1,000
Conversion of preferred stock (in dollars per share)			$ 0.28
Series A-2 Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares) (up to)		7,500
Shares issued (in shares)		32
Shares outstanding (in shares)		32
Stated value (in dollars per share)		$ 7,500
Conversion of preferred stock (in dollars per share)		$ 2.9835
Convertible preferred stock, shares issued upon conversion (in shares)		2,514
Conversion of preferred stock adjustment (in dollars per share)		$ 0
Cumulative dividend percentage rate, per annum		5.00%
Accrued dividends		$ 56
Redemption price per share (in dollars per share)		$ 8,250
Redemption price per share, value applied to multiplier (in dollars per share)		$ 7,500
Redemption price per share, multiplier, percentage		110.00%
Series A-2 Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Conversion of preferred stock adjustment (in dollars per share)	$ 2.40
Series D Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares) (up to)		4,000
Shares issued (in shares)		0
Shares outstanding (in shares)		0
Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares) (up to)		5,000,000