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Revenue - Impacts on financial statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Pro forma Balance Sheet:            
Accounts receivable, net of allowance $ 41,704   $ 41,704     $ 48,126
Contract asset 4,915   4,915      
Other current assets 7,978   7,978     5,501
Total current assets 176,812   176,812     227,937
Deferred income taxes 4,922   4,922     5,460
Contract assets - non-current 7,534   7,534      
Other assets 6,649   6,649     5,229
Total assets 347,092   347,092     337,622
Deferred revenue 30,675   30,675     33,295
Short-term income taxes payable 1,599   1,599     3,673
Other accrued expenses 10,680   10,680     7,746
Total current liabilities 60,894   60,894     66,153
Deferred revenue - non-current 6,947   6,947     7,019
Deferred income taxes 9,131   9,131     7,753
Total liabilities 96,176   96,176     99,692
Accumulated income 169,317   169,317     156,151
Total stockholders' equity 250,916   250,916     237,930
Total liabilities and stockholders' equity 347,092   347,092     $ 337,622
Pro format Income Statement:            
Revenue 49,554 $ 45,694 94,986 $ 87,658    
Cost of goods sold 13,573 13,646 24,308 25,698    
Gross profit 35,981 32,048 70,678 61,960    
Sales and marketing 16,622 15,339 30,899 29,043    
Total operating costs 38,592 32,448 71,641 62,059    
Operating loss (2,611) (400) (963) (99)    
Income before taxes (872) 313 1,549 1,119    
Provision for income taxes 130 203 759 436    
Net income (loss) $ (1,002) $ 110 $ 790 $ 683    
Basic (in dollars per share) $ (0.03) $ 0.00 $ 0.02 $ 0.02    
Diluted (in dollars per share) $ (0.03) $ 0.00 $ 0.02 $ 0.02    
Product and license            
Pro format Income Statement:            
Revenue $ 34,986 $ 34,472 $ 68,480 $ 66,032    
Cost of goods sold 10,391 11,045 18,576 20,585    
Service and other            
Pro format Income Statement:            
Revenue 14,568 11,222 26,506 21,626    
Cost of goods sold 3,182 $ 2,601 5,732 $ 5,113    
ASU 2014-09            
Pro forma Balance Sheet:            
Accumulated income         $ 11,900  
ASU 2014-09 | Adjustments            
Pro forma Balance Sheet:            
Accounts receivable, net of allowance (266)   (266)      
Contract asset (4,915)   (4,915)      
Other current assets (59)   (59)      
Total current assets (5,240)   (5,240)      
Deferred income taxes 507   507      
Contract assets - non-current (7,534)   (7,534)      
Other assets (150)   (150)      
Total assets (12,417)   (12,417)      
Deferred revenue 2,820   2,820      
Short-term income taxes payable (2,689)   (2,689)      
Other accrued expenses (116)   (116)      
Total current liabilities 15   15      
Deferred revenue - non-current 1,751   1,751      
Deferred income taxes (424)   (424)      
Total liabilities 1,342   1,342      
Accumulated income (13,759)   (13,759)      
Total stockholders' equity (13,759)   (13,759)      
Total liabilities and stockholders' equity (12,417)   (12,417)      
Pro format Income Statement:            
Revenue 679   (2,466)      
Cost of goods sold 141   534      
Gross profit 538   (3,000)      
Sales and marketing 225   607      
Total operating costs 225   607      
Operating loss 313   (3,607)      
Income before taxes 313   (3,607)      
Provision for income taxes (748)   (1,767)      
Net income (loss) 1,061   (1,840)      
ASU 2014-09 | Balances without the adoption of Topic 606            
Pro forma Balance Sheet:            
Accounts receivable, net of allowance 41,438   41,438      
Other current assets 7,919   7,919      
Total current assets 171,572   171,572      
Deferred income taxes 5,429   5,429      
Other assets 6,499   6,499      
Total assets 334,675   334,675      
Deferred revenue 33,495   33,495      
Short-term income taxes payable (1,090)   (1,090)      
Other accrued expenses 10,564   10,564      
Total current liabilities 60,909   60,909      
Deferred revenue - non-current 8,698   8,698      
Deferred income taxes 8,707   8,707      
Total liabilities 97,518   97,518      
Accumulated income 155,558   155,558      
Total stockholders' equity 237,157   237,157      
Total liabilities and stockholders' equity 334,675   334,675      
Pro format Income Statement:            
Revenue 50,233   92,520      
Cost of goods sold 13,714   24,842      
Gross profit 36,519   67,678      
Sales and marketing 16,847   31,506      
Total operating costs 38,817   72,248      
Operating loss (2,298)   (4,570)      
Income before taxes (559)   (2,058)      
Provision for income taxes (618)   (1,008)      
Net income (loss) $ 59   $ (1,050)      
Basic (in dollars per share) $ 0.00   $ (0.03)      
Diluted (in dollars per share) $ 0.00   $ (0.03)      
ASU 2014-09 | Product and license | Adjustments            
Pro format Income Statement:            
Revenue $ 2,372   $ (75)      
Cost of goods sold 141   534      
ASU 2014-09 | Product and license | Balances without the adoption of Topic 606            
Pro format Income Statement:            
Revenue 37,358   68,405      
Cost of goods sold 10,532   19,110      
ASU 2014-09 | Service and other | Adjustments            
Pro format Income Statement:            
Revenue (1,693)   (2,391)      
ASU 2014-09 | Service and other | Balances without the adoption of Topic 606            
Pro format Income Statement:            
Revenue 12,875   24,115      
Cost of goods sold $ 3,182   $ 5,732