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Acquisition of eSignLive - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 25, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]                        
Net income (loss)   $ 5,012 $ 478 $ 2,825 $ 2,199 $ 3,484 $ 11,182 $ 13,852 $ 13,634 $ 10,514 $ 42,151 $ 33,484
Statutory income tax rate                   34.00% 34.00% 35.00%
Estimated amortization of acquired identifiable intangible assets                   $ 8,849 $ 4,942 $ 4,532
Silanis Technology Inc [Member]                        
Business Acquisition [Line Items]                        
Aggregate purchase price $ 75,000                      
Revenue                     541  
Net income (loss)                     (2,168)  
Business combination provisional information initial accounting incomplete adjustment liabilities   9,146                    
Business combination provisional information initial accounting incomplete adjustment goodwill   9,146                    
Business combination provisional information initial accounting incomplete adjustment tax provision   $ 2,344                    
Estimated amortization of acquired identifiable intangible assets                     6,060 6,060
Estimated amortization of fair value adjustment of acquired deferred revenue                     (4,000) 0
Reclassify non-recurring transaction expenses                       5,812
Reverse benefit of refundable tax credits                     1,021 $ 1,588
Silanis Technology Inc [Member] | Selling, General and Administrative Expenses [Member]                        
Business Acquisition [Line Items]                        
Acquisition related expense                     $ 2,374  
Silanis Technology Inc [Member] | Pro Forma [Member]                        
Business Acquisition [Line Items]                        
Statutory income tax rate                     35.00% 35.00%