Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Shares authorized (in shares)	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	$ 53	$ 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)	100
Shares issued (in shares)	0
Shares outstanding (in shares)	0
Series A-2 Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares)	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%
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 D Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares)	4,000
Shares issued (in shares)	0
Shares outstanding (in shares)	0
Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares)	5,000,000