Annual report pursuant to Section 13 and 15(d)

Acquisition of Kulu Valley, Ltd Narrative (Details)

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Acquisition of Kulu Valley, Ltd Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 12 Months Ended
Oct. 03, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]                        
Cash paid for acquisition of business, net of cash acquired                   $ 0 $ 11,556,000 $ 0
Share price $ 12.95                      
Weighted-average useful lives (years)                   9 years 9 years  
Amortization of purchased intangibles   $ 199,000 $ 200,000 $ 200,000 $ 199,000 $ 182,000 $ 157,000 $ 156,000 $ 157,000 $ 798,000 $ 652,000 627,000
Net deferred tax liability   518,000       1,115,000       518,000 1,115,000  
Deferred tax liability   3,466,000       3,965,000       3,466,000 3,965,000  
Deferred tax assets   $ 31,876,000       $ 22,766,000       $ 31,876,000 $ 22,766,000  
Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Percentage of voting interests acquired (in percent) 100.00%                      
Net transaction consideration $ 14,591,000                      
Cash paid for acquisition of business, net of cash acquired 11,556,000                      
Cash acquired from acquisition $ 2,466,000                      
Aggregate purchase price, in shares 275                      
Sale of stock, price per share $ 13.75                      
Escrow deposit $ 2,000,000                      
Escrow lapsed period 15 months                      
Accounting adjustments to reduce carrying value of deferred revenues $ 1,100,000                      
Revenues generated during the post-acquisition period 464,000                      
Transaction costs related to business acquisitions 245,000                      
Intangible assets 6,663,000                      
Net deferred tax liability 1,300,000                      
Deferred tax liability 1,500,000                      
Deferred tax assets 200,000                      
Developed technology                        
Business Acquisition [Line Items]                        
Weighted-average useful lives (years)                   6 years 6 years  
Developed technology | Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Intangible assets 4,233,000                      
Customer relationships                        
Business Acquisition [Line Items]                        
Weighted-average useful lives (years)                   10 years 10 years  
Customer relationships | Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Intangible assets 2,315,000                      
Trademarks / trade names                        
Business Acquisition [Line Items]                        
Weighted-average useful lives (years)                   15 years 15 years  
Trademarks / trade names | Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Intangible assets 74,000                      
Covenant not-to-compete                        
Business Acquisition [Line Items]                        
Weighted-average useful lives (years)                   2 years 2 years  
Covenant not-to-compete | Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Intangible assets $ 41,000                      
Minimum | Trademarks / trade names | Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Weighted-average useful lives (years) 15 months                      
Maximum | Trademarks / trade names | Kulu Valley Ltd                        
Business Acquisition [Line Items]                        
Weighted-average useful lives (years) 9 years                      
Cost of revenues                        
Business Acquisition [Line Items]                        
Amortization of purchased intangibles                   $ 1,268,000 $ 650,000 560,000
Amortization of purchased intangibles                        
Business Acquisition [Line Items]                        
Amortization of purchased intangibles                   $ 798,000 $ 652,000 $ 627,000