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Supplementary Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
Quarter ended:
  
Dec. 31,
201
8
    
Sept. 30,
201
8
    
June 30,
201
8
    
March 31,
201
8
    
Dec. 31,
201
7
    
Sept. 30,
201
7
    
June 30,
201
7
    
March 31,
201
7
  
Net revenue
   $
45,469
     $
40,573
     $
42,553
     $
34,125
     $
47,632
     $
38,173
     $
36,389
     $
29,299
  
Cost of revenue
    
26,683
      
18,688
      
20,176
      
16,791
      
20,299
      
15,963
      
15,343
      
13,778
  
Gross profit
    
18,786
      
21,885
      
22,377
      
17,334
      
27,333
      
22,210
      
21,046
      
15,521
  
Operating expenses:
                                                                
Sales and marketing
    
15,318
      
14,479
      
15,535
      
13,088
      
15,362
      
13,148
      
12,787
      
10,773
  
Research and development
    
3,464
      
3,244
      
4,095
      
3,556
      
3,481
      
3,467
      
2,981
      
2,945
  
General and administrative
    
5,494
      
5,160
      
4,902
      
5,439
      
3,947
      
3,379
      
3,548
      
3,216
  
Lease termination income
    
—
      
—
      
—
      
—
      
—
      
(4,000
 )    
—
      
—
  
Total operating expenses
    
24,276
      
22,883
      
24,532
      
22,083
      
22,790
      
15,994
      
19,316
      
16,934
  
Income (loss) from operations
    
(5,490
 )    
(998
 )    
(2,155
)
    
(4,749
)
    
4,543
      
6,216
      
1,730
      
(1,413
 )
Interest and other income, net
    
(44
)
    
(49
 )    
(129
 )    
98
      
138
      
197
      
276
      
273
  
Income (loss) before income taxes
    
(5,534
 )    
(1,047
 )    
(2,284
 )    
(4,651
 )    
4,681
      
6,413
      
2,006
      
(1,140
)
Income tax provision
    
20,760
      
(174
 )    
(712
 )    
(2,619
 )    
(18,199
 )    
225
      
59
      
(118
 )
Net income (loss)
   $
(26,293
 )   $
(873
 )   $
(1,572
 )   $
(2,032
)
   $
22,880
     $
6,188
     $
1,947
     $
(1,022
)
Net income (loss) per share—basic
   $
(1.89
 )   $
(0.06
 )   $
(0.11
)
   $
(0.15
)
   $
1.66
     $
0.44
     $
0.14
     $
(0.07
)
Net income (loss) per share—diluted
   $
(1.89
 )   $
(0.06
 )   $
(0.11
)
   $
(0.15
)
   $
1.57
     $
0.42
     $
0.13
     $
(0.07
)
Weighted average number of shares used in per share calculations:
                                                                
Basic
    
13,932
      
13,851
      
13,709
      
13,587
      
13,744
      
13,973
      
13,935
      
13,840
  
Diluted
    
13,932
      
13,851
      
13,709
      
13,587
      
14,569
      
14,767
      
14,629
      
13,840