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Stockholders' Equity and Redeemable Convertible Preferred Stock (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Aug. 08, 2016
May 23, 2016
Mar. 04, 2016
Feb. 26, 2016
Dec. 07, 2015
Dec. 02, 2015
Nov. 23, 2015
May 28, 2014
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2013
Dec. 31, 2015
Description of reverse stock split    

1-for-19

1-for-12 to 1-for-24

                
Common stock, authorized       100,000,000         100,000,000     100,000,000
Common stock, authorized previously       200,000,000                
Number of preferred stock authorized                 50,000,000     50,000,000
Cash proceeds from warrants exercised                 $ 760    
Underwriting Agreement [Member] | IPO [Member]                        
Number of shares issued 1,592,357                      
Value of shares issued $ 2,100                      
Shares issued price per share $ 1.57                      
Additional shares 231,349                      
Series H Convertible Preferred Stock [Member]                        
Number of preferred stock authorized                   459,043  
Number of shares issued                     459,043  
Value of shares issued                     $ 38,300  
Description of stock conversion terms                    

Each share of Series H Preferred Stock is convertible into ten-nineteenths of a share of Common Stock.

  
Preferred stock liquidation preference (in dollars per share)                     $ 83.50  
Description of prefered stock voting rights                    

Holders of the Series H Preferred Stock shall be entitled to vote on all matters submitted to the Company’s stockholders and shall be entitled to the number of votes equal to the number of shares of Common Stock into which the shares of Series H Preferred Stock are convertible, subject to applicable beneficial ownership limitations. 

  
Number of shares converted               20,000        
Number of preferred stock converted               10,526        
Preferred stock issued                     381,967
Preferred stock outstanding                     381,967
Series H Convertible Preferred Stock [Member] | Patent License Agreement [Member] | RPX Corporation [Member]                        
Number of shares cancelled             57,076          
Number of shares cancelled,value             $ 4,765,846          
Series H Convertible Preferred Stock [Member] | Second Patent License Agreement [Member] | RPX Corporation [Member]                        
Number of shares cancelled   381,967                    
Number of shares cancelled,value   $ 31,894,244                    
Series K Convertible Preferred Stock [Member]                        
Number of preferred stock authorized           1,240          
Number of shares issued         1,240              
Description of stock conversion terms          

Each share of Series K Preferred Stock is convertible into five thousand-nineteenths of a share of Common Stock.

            
Preferred stock liquidation preference (in dollars per share)           $ 1,000            
Description of prefered stock voting rights          

The Series K Preferred does not generally have any voting rights but are convertible into shares of Common Stock.

            
Number of preferred stock converted                 326,315      
Preferred stock issued                     1,240
Preferred stock outstanding                     1,240