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Supplementary Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
Quarter ended:
  
Dec. 31,
2017
    
Sept. 30,
2017
    
June 30,
2017
    
March 31,
2017
    
Dec. 31,
201
6
    
Sept. 30,
201
6
    
June 30,
201
6
    
March 31,
201
6
  
Net revenue
   $
47,632
     $
38,173
     $
36,389
     $
29,299
     $
37,875
     $
30,281
     $
27,477
     $
22,423
  
Cost of revenue
    
20,299
      
15,963
      
15,343
      
13,778
      
15,962
      
12,538
      
11,472
      
9,949
  
Gross profit
    
27,333
      
22,210
      
21,046
      
15,521
      
21,913
      
17,743
      
16,005
      
12,474
  
Operating expenses:
                                                                
Sales and marketing
    
15,362
      
13,148
      
12,787
      
10,773
      
11,561
      
10,574
      
10,712
      
8,716
  
Research and development
    
3,481
      
3,467
      
2,981
      
2,945
      
2,897
      
2,914
      
2,712
      
2,709
  
General and administrative
    
3,947
      
3,379
      
3,548
      
3,216
      
3,010
      
2,716
      
3,997
      
3,220
  
Lease termination income    
-
      
(4,000
 )    
-
      
-
      
-
      
-
      
-
      
-
  
Total operating expenses
    
22,790
      
15,994
      
19,316
      
16,934
      
17,468
      
16,204
      
17,421
      
14,645
  
Income (loss) from operations
    
4,543
      
6,216
      
1,730
      
(1,413
 )    
4,445
      
1,539
      
(1,416
 )    
(2,171
 )
Interest and other income, net
    
138
      
197
      
276
      
273
      
(204
 )    
166
      
217
      
144
  
Income (loss) before income taxes
    
4,681
      
6,413
      
2,006
      
(1,140
 )    
4,241
      
1,705
      
(1,199
 )    
(2,027
 )
Income tax provision (benefit)
    
(18,199
 )    
225
      
59
      
(118
 )    
28
      
61
      
30
      
24
  
Net income (loss)
   $
22,880
     $
6,188
     $
1,947
     $
(1,022
 )   $
4,213
     $
1,644
     $
(1,229
 )   $
(2,051
 )
                                                                 
Net income (loss) per share
—basic
   $
1.66
     $
0.44
     $
0.14
     $
(0.07
 )   $
0.31
     $
0.12
     $
(0.09
 )   $
(0.16
 )
Net income (loss) per share
—diluted
   $
1.57
     $
0.42
     $
0.13
     $
(0.07
 )   $
0.30
     $
0.12
     $
(0.09
 )   $
(0.16
 )
                                                                 
Weighted average number of shares used in per share calculations:
                                                                
Basic
    
13,744
      
13,973
      
13,935
      
13,840
      
13,591
      
13,163
      
13,131
      
13,010
  
Diluted
    
14,569
      
14,767
      
14,629
      
13,840
      
14,201
      
13,544
      
13,131
      
13,010