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Stockholders' Equity and Redeemable Convertible Preferred Stock (Details Narrative 1) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jul. 18, 2017
Aug. 08, 2016
May 23, 2016
Dec. 07, 2015
Dec. 02, 2015
Nov. 23, 2015
May 28, 2014
Dec. 31, 2013
Nov. 22, 2013
Mar. 06, 2013
Jan. 02, 2013
Jun. 30, 2015
Sep. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Value of shares issued                           $ 2,095 $ 2,140  
IPO [Member] | Underwriting Agreement [Member]                                
Number of shares issued   1,592,357                            
Value of shares issued   $ 2,100                            
Series J Convertible Preferred Stock [Member]                                
Number of preferred stock authorized             20,000,000                  
Description of prefered stock voting rights            

Each holder of Series J Preferred Stock is entitled to vote on all matters submitted to stockholders of the Company and is entitled to a vote of 67.3% of the number of votes for each share of Common Stock into which the Series J Preferred Stock is convertible owned at the record date for the determination of stockholders entitled to vote on such matter.

                  
Preferred stock issued                           0 0  
Preferred stock outstanding                           0 0  
Series K Convertible Preferred Stock [Member]                                
Number of preferred stock authorized         1,240                      
Preferred stock liquidation preference (in dollars per share)                           $ 1,000    
Preferred stock issued                           0 0  
Preferred stock outstanding                           0 0  
Series A Preferred Stock [Member]                                
Number of shares issued                           500,000    
Preferred stock issued                           0 0  
Preferred stock outstanding                           0 0  
Series C Convertible Preferred Stock [Member]                                
Preferred stock issued                           0 0  
Preferred stock outstanding                           0 0  
Series H Convertible Preferred Stock [Member]                                
Number of preferred stock authorized               459,043               459,043
Preferred stock, par value (in dollars per share)               $ 83.50           $ 0.0001 $ 0.0001 $ 83.50
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               $ 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             10,526                  
Number of preferred stock converted             20,000                  
Preferred stock issued                            
Preferred stock outstanding                            
Series K Convertible Preferred Stock [Member]                                
Number of preferred stock authorized         1,240                      
Preferred stock, par value (in dollars per share)                           $ 0.0001 $ 0.0001  
Description of stock conversion terms        

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

                      
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                            
Preferred stock outstanding                            
Series K Convertible Preferred Stock [Member] | December 2015 Offering [Member]                                
Number of shares issued       1,240                        
Series I Convertible Preferred Stock [Member]                                
Number of preferred stock authorized               119,760               119,760
Preferred stock, par value (in dollars per share)               $ 167.00               $ 167.00
Description of stock conversion terms                              

Each share of Series I Preferred Stock was convertible into twenty-nineteenths of a share of Common Stock.
Preferred stock liquidation preference (in dollars per share)               $ 167.00               $ 167.00
Description of prefered stock voting rights                              

 Holders of the Series I Preferred Stock shall be entitled to vote on all matters submitted to its 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 I Preferred Stock were convertible, subject to applicable beneficial ownership limitations.
Preferred stock issued                           0 0  
Preferred stock outstanding                           0 0  
Redemption date                               Dec. 31, 2015
Description of partial redemption terms                              

(i) such number of shares of Series I Preferred Stock as had a stated value of $5.0 million; or (ii) such number of shares of Series I Preferred Stock as should, together with all voluntary and mandatory redemptions and conversions to Common Stock occurring prior to the applicable Partial Redemption Date, had an aggregate stated value of $5.0 million; or (iii) the remaining shares of Series I Preferred Stock issued and outstanding if such shares had an aggregate stated value of less than $5.0 million, in an amount of cash equal to its stated value plus all accrued but unpaid dividends, distributions and interest thereon, unless such holder of Series I Preferred Stock, in its sole discretion, elected to waive such Redemption Payment or convert such shares of Series I Preferred Stock (or a portion thereof) into Common Stock.
Description of collateral                              

Rockstar patent portfolio serves as collateral security.
Description of fundamental transaction                              

(i) 50% of the net proceeds of the Fundamental Transaction after deduction of the amount of net proceeds required to leave the Company with cash and cash equivalents on hand of $5.0 million and up until the net proceeds leave the Company with cash and cash equivalents on hand of $7.5 million and (ii) 100% of the net proceeds of the Fundamental Transaction thereafter.
Series D-1 Convertible Preferred Stock [Member]                                
Preferred stock, par value (in dollars per share)                 $ 0.0001              
Description of stock conversion terms                

Convertible into ten- nineteenths of a share of Common Stock.

              
Preferred stock liquidation preference (in dollars per share)                           $ 0.0001 $ 0.0001  
Description of prefered stock voting rights                

Each holder of Series D-1 Preferred Stock shall be entitled to vote on all matters submitted to the Company’s stockholders and shall be entitled to such number of votes equal to the number of shares of Common Stock such shares of Series D-1 Preferred Stock are convertible into at such time, taking into account the beneficial ownership limitations set forth in the governing Certificate of Designation. 

              
Preferred stock issued                           834 834  
Preferred stock outstanding                           834 834  
Series D Preferred Stock [Member]                                
Number of preferred stock authorized                            
Preferred stock, par value (in dollars per share)                            
Preferred stock liquidation preference (in dollars per share)                           $ 0.0001 $ 0.0001  
Preferred stock issued                           4,725 4,725  
Preferred stock outstanding                           4,725 4,725  
Series H Convertible Preferred Stock [Member]                                
Preferred stock issued                           0 0  
Preferred stock outstanding                           0 0  
RPX Corporation [Member] | Series H Convertible Preferred Stock [Member] | Second Patent License Agreement [Member]                                
Number of shares cancelled     381,967                          
Number of shares cancelled,value     $ 31,894,244                          
RPX Corporation [Member] | Series H Convertible Preferred Stock [Member] | Patent License Agreement [Member]                                
Number of shares cancelled           57,076                    
Number of shares cancelled,value           $ 4,765,846                    
RPX Corporation [Member] | Series I Convertible Preferred Stock [Member]                                
Number of sahres redeemed                       5,601        
Value of shares redeemed                       $ 900        
Laidlaw & Company (UK) Ltd. [Member] | Underwriting Agreement [Member]                                
Number of shares issued 1,250,000                              
Net proceeds form offering $ 2,100                              
Laidlaw & Company (UK) Ltd. [Member] | Series J Convertible Preferred Stock [Member] | Direct Public Offering [Member] | Placement Agency Agreement [Member]                                
Number of shares issued in offering             10,000,000                  
Public offering price (in dollars per share)             $ 2.00                  
Net proceeds form offering             $ 18,400                  
Aggregate conversion shares             526,315                  
Legal fees             $ 180                  
Placement agent fees             1,320                  
Escrow fees             $ 40                  
RPX Corporation [Member] | Series H Convertible Preferred Stock [Member]                                
Preferred stock liquidation preference (in dollars per share)     $ 83.50                          
RPX Corporation [Member] | Series H Convertible Preferred Stock [Member] | Second Patent License Agreement [Member]                                
Number of shares cancelled     381,967                          
Number of shares cancelled,value     $ 31,894,244                          
RPX Corporation [Member] | Series I Convertible Preferred Stock [Member] | Patent License Agreement [Member]                                
Number of shares cancelled           29,940                    
Number of shares cancelled,value           $ 5,000                    
Stockholder Rights Plan [Member] | Series A Preferred Stock [Member]                                
Description of rights to purchase                    

Distributed as a dividend at the rate of one right for each share of common stock.

          
Description of units                    

Each right entitles the registered holder to purchase nineteen one-hundredths of a share (a “Unit”) of the Company’s Series A Preferred Stock.

          
Description of dividend preference                    

Each Unit of Series A Preferred Stock will be entitled to an aggregate dividend of 100 times the dividend declared per share of common stock.

          
Rights redeem (in dollars per share)                     $ 0.001          
Rights expiration date                     Dec. 31, 2017          
Stockholder Rights Plan [Member] | Series C Convertible Preferred Stock [Member]                                
Description of units                  

Each share of Series C Preferred Stock is convertible into one-nineteenth of a share of Common Stock at the option of the holder.

            
North South Patent Portfolio Acquired 9/10/13 [Member] | Series D Preferred Stock [Member]                                
Preferred stock, par value (in dollars per share)                         $ 0.0001      
Number of shares issued                         1,379,685      
Description of stock conversion terms                        

Convertible into ten-nineteenths of a share of Common Stock.

      
Institutional Investors [Member] | Warrant [Member] | Series C Convertible Preferred Stock [Member] | November 2012 Private Placement [Member] | Warrant Exchange Agreements [Member]                                
Common stock warrants exchanged                   229,337            
Description of stock conversion terms                  

Convertible into one-nineteenth of a share of Common Stock at the option of the holder.

            
Rockstar Consortium US LP [Member] | Series I Convertible Preferred Stock [Member]                                
Number of shares issued               119,760                
Value of shares issued               $ 20,000