Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Armistice Private Placement (Details)

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Capital Structure - Armistice Private Placement (Details) - Securities Purchase Agreement - USD ($)
$ / shares in Units, $ in Thousands
Jul. 06, 2017
Apr. 27, 2017
Class of Stock [Line Items]    
Value of securities issued   $ 5,000
Proceeds from sale of shares under common stock purchase agreements   $ 4,650
Warrants to purchase shares of common stock, maximum, shares   14,285,714
Exercise price per share (usd per share)   $ 0.40
Common stock    
Class of Stock [Line Items]    
Common stock issued (in shares)   2,345,714
Share price (usd per share)   $ 0.35
Shares of common stock purchased as a percent of outstanding shares   19.99%
Conversion of preferred stock, shares issued 11,940,000  
Preferred Stock | Series A Preferred Stock    
Class of Stock [Line Items]    
Common stock issued (in shares)   4,179
Share price (usd per share)   $ 1,000