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License, Settlement and Release Agreement - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 13, 2017
USD ($)
Jan. 15, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 30, 2015
USD ($)
Nov. 15, 2015
USD ($)
Apr. 07, 2015
USD ($)
patent
Jan. 16, 2015
USD ($)
Sep. 24, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jan. 13, 2017
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Jul. 01, 2016
USD ($)
Dec. 31, 2014
USD ($)
Patents                              
Loss Contingencies [Line Items]                              
License revenue                   $ 700          
License fee receivable                 $ 1,000 $ 1,000          
Licensing Agreements                              
Loss Contingencies [Line Items]                              
Receivable related to license agreement                             $ 2,000
License revenue                 $ 5,000            
License fee receivable               $ 8,000              
License agreement installment             $ 2,000 $ 3,000              
Legal fees                       $ 800      
United States-based third party | Licensing Agreements                              
Loss Contingencies [Line Items]                              
Sale of patent in license agreement       $ 3,650                      
Cash received from license agreement       1,000                      
Receivable related to license agreement       2,650                      
License revenue     $ 1,000                        
License fee receivable       $ 3,650                      
European-based third party | Patents                              
Loss Contingencies [Line Items]                              
Sale of patent in license agreement         $ 2,975                    
License revenue     $ 2,975                        
F-Secure Corporation | Patents                              
Loss Contingencies [Line Items]                              
Sale of patent in license agreement           $ 1,000                  
Cash received from license agreement           700                  
Receivable related to license agreement           $ 300                  
Number of patents sold in license agreement | patent           2                  
Forecast                              
Loss Contingencies [Line Items]                              
License revenue $ 3,700                            
Forecast | Licensing Agreements                              
Loss Contingencies [Line Items]                              
License agreement installment $ 1,000 $ 2,000                 $ 3,000        
Forecast | United States-based third party | Licensing Agreements                              
Loss Contingencies [Line Items]                              
Receivable related to license agreement                         $ 1,000 $ 1,650