| Segment information | 
Segment information for the three and nine months ended December 31, 2015, and 2014 is set forth below: 
 
 
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   | 
   | 
Three months ended December 31, 2015  | 
 
(in thousands)  | 
   | 
IBW  | 
   | 
CSG  | 
   | 
Total  | 
 
Revenue  | 
   | 
$  | 
8,680  | 
 
  | 
   | 
$  | 
11,535  | 
 
  | 
   | 
$  | 
20,215  | 
 
  | 
 
Cost of revenue  | 
   | 
5,361  | 
 
  | 
   | 
6,891  | 
 
  | 
   | 
12,252  | 
 
  | 
 
Gross profit  | 
   | 
3,319  | 
 
  | 
   | 
4,644  | 
 
  | 
   | 
7,963  | 
 
  | 
 
Gross margin  | 
   | 
38.2  | 
%  | 
   | 
40.3  | 
%  | 
   | 
39.4  | 
%  | 
 
Research and development  | 
   | 
2,701  | 
 
  | 
   | 
2,192  | 
 
  | 
   | 
4,893  | 
 
  | 
 
Segment profit (loss)  | 
   | 
$  | 
618  | 
 
  | 
   | 
$  | 
2,452  | 
 
  | 
   | 
3,070  | 
 
  | 
 
Operating expenses:  | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Sales and marketing  | 
   | 
   | 
   | 
   | 
   | 
3,900  | 
 
  | 
 
General and administrative  | 
   | 
   | 
   | 
   | 
   | 
2,627  | 
 
  | 
 
Intangible amortization  | 
   | 
   | 
   | 
   | 
   | 
1,418  | 
 
  | 
 
Restructuring  | 
   | 
   | 
   | 
   | 
   | 
—  | 
 
  | 
 
Operating income (loss)  | 
   | 
   | 
   | 
   | 
   | 
(4,875  | 
)  | 
 
Other income (expense), net  | 
   | 
   | 
   | 
   | 
   | 
85  | 
 
  | 
 
Income tax benefit (expense)  | 
   | 
   | 
   | 
   | 
   | 
(7  | 
)  | 
 
Net income (loss) from continuing operations  | 
   | 
   | 
   | 
   | 
   | 
$  | 
(4,797  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
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   | 
   | 
Three months ended December 31, 2014  | 
 
(in thousands)  | 
   | 
IBW  | 
   | 
CSG  | 
   | 
Total  | 
 
Revenue  | 
   | 
$  | 
5,414  | 
 
  | 
   | 
$  | 
8,629  | 
 
  | 
   | 
$  | 
14,043  | 
 
  | 
 
Cost of revenue  | 
   | 
3,504  | 
 
  | 
   | 
6,144  | 
 
  | 
   | 
9,648  | 
 
  | 
 
Gross profit  | 
   | 
1,910  | 
 
  | 
   | 
2,485  | 
 
  | 
   | 
4,395  | 
 
  | 
 
Gross margin  | 
   | 
35.3  | 
%  | 
   | 
28.8  | 
%  | 
   | 
31.3  | 
%  | 
 
Research and development  | 
   | 
2,342  | 
 
  | 
   | 
2,011  | 
 
  | 
   | 
4,353  | 
 
  | 
 
Segment profit (loss)  | 
   | 
$  | 
(432  | 
)  | 
   | 
$  | 
474  | 
 
  | 
   | 
42  | 
 
  | 
 
Operating expenses:  | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Sales and marketing  | 
   | 
   | 
   | 
   | 
   | 
2,719  | 
 
  | 
 
General and administrative  | 
   | 
   | 
   | 
   | 
   | 
2,797  | 
 
  | 
 
Intangible amortization  | 
   | 
   | 
   | 
   | 
   | 
1,562  | 
 
  | 
 
Restructuring  | 
   | 
   | 
   | 
   | 
   | 
—  | 
 
  | 
 
Goodwill impairment  | 
   | 
   | 
   | 
   | 
   | 
20,547  | 
 
  | 
 
Operating income (loss)  | 
   | 
   | 
   | 
   | 
   | 
(27,583  | 
)  | 
 
Other income (expense), net  | 
   | 
   | 
   | 
   | 
   | 
(29  | 
)  | 
 
Income tax benefit (expense)  | 
   | 
   | 
   | 
   | 
   | 
72  | 
 
  | 
 
Net income (loss) from continuing operations  | 
   | 
   | 
   | 
   | 
   | 
$  | 
(27,540  | 
)  | 
 
   | 
   | 
   | 
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   | 
   | 
Nine months ended December 31, 2015  | 
 
(in thousands)  | 
   | 
IBW  | 
   | 
CSG  | 
   | 
Total  | 
 
Revenue  | 
   | 
$  | 
28,569  | 
 
  | 
   | 
$  | 
38,730  | 
 
  | 
   | 
$  | 
67,299  | 
 
  | 
 
Cost of revenue  | 
   | 
16,702  | 
 
  | 
   | 
23,974  | 
 
  | 
   | 
40,676  | 
 
  | 
 
Gross profit  | 
   | 
11,867  | 
 
  | 
   | 
14,756  | 
 
  | 
   | 
26,623  | 
 
  | 
 
Gross margin  | 
   | 
41.5  | 
%  | 
   | 
38.1  | 
%  | 
   | 
39.6  | 
%  | 
 
Research and development  | 
   | 
8,638  | 
 
  | 
   | 
5,966  | 
 
  | 
   | 
14,604  | 
 
  | 
 
Segment profit (loss)  | 
   | 
$  | 
3,229  | 
 
  | 
   | 
$  | 
8,790  | 
 
  | 
   | 
12,019  | 
 
  | 
 
Operating expenses:  | 
   | 
   | 
   | 
   | 
   | 
 
  | 
 
  | 
 
Sales and marketing  | 
   | 
   | 
   | 
   | 
   | 
11,209  | 
 
  | 
 
General and administrative  | 
   | 
   | 
   | 
   | 
   | 
8,089  | 
 
  | 
 
Intangible amortization  | 
   | 
   | 
   | 
   | 
   | 
4,249  | 
 
  | 
 
Restructuring  | 
   | 
   | 
   | 
   | 
   | 
17  | 
 
  | 
 
Operating income (loss)  | 
   | 
   | 
   | 
   | 
   | 
(11,545  | 
)  | 
 
Other income (expense), net  | 
   | 
   | 
   | 
   | 
   | 
62  | 
 
  | 
 
Income tax benefit (expense)  | 
   | 
   | 
   | 
   | 
   | 
75  | 
 
  | 
 
Net income (loss) from continuing operations  | 
   | 
   | 
   | 
   | 
   | 
$  | 
(11,408  | 
)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
   | 
   | 
Nine months ended December 31, 2014  | 
 
(in thousands)  | 
   | 
IBW  | 
   | 
CSG  | 
   | 
Total  | 
 
Revenue  | 
   | 
$  | 
30,632  | 
 
  | 
   | 
$  | 
34,882  | 
 
  | 
   | 
$  | 
65,514  | 
 
  | 
 
Cost of revenue  | 
   | 
18,543  | 
 
  | 
   | 
24,827  | 
 
  | 
   | 
43,370  | 
 
  | 
 
Gross profit  | 
   | 
12,089  | 
 
  | 
   | 
10,055  | 
 
  | 
   | 
22,144  | 
 
  | 
 
Gross margin  | 
   | 
39.5  | 
%  | 
 
  | 
28.8  | 
%  | 
   | 
33.8  | 
%  | 
 
Research and development  | 
   | 
6,640  | 
 
  | 
   | 
6,488  | 
 
  | 
   | 
13,128  | 
 
  | 
 
Segment profit (loss)  | 
   | 
$  | 
5,449  | 
 
  | 
   | 
$  | 
3,567  | 
 
  | 
   | 
9,016  | 
 
  | 
 
Operating expenses:  | 
   | 
   | 
   | 
   | 
   | 
 
  | 
 
  | 
 
Sales and marketing  | 
   | 
   | 
   | 
   | 
   | 
9,064  | 
 
  | 
 
General and administrative  | 
   | 
   | 
   | 
   | 
   | 
9,131  | 
 
  | 
 
Intangible amortization  | 
   | 
   | 
   | 
   | 
   | 
4,857  | 
 
  | 
 
Restructuring  | 
   | 
   | 
   | 
   | 
   | 
55  | 
 
  | 
 
Goodwill impairment  | 
   | 
   | 
   | 
   | 
   | 
31,997  | 
 
  | 
 
Operating income (loss)  | 
   | 
   | 
   | 
 
  | 
 
  | 
   | 
(46,088  | 
)  | 
 
Other income (expense), net  | 
   | 
   | 
   | 
   | 
   | 
16  | 
 
  | 
 
Income tax benefit (expense)  | 
   | 
   | 
   | 
   | 
   | 
170  | 
 
  | 
 
Net income (loss) from continuing operations  | 
   | 
   | 
   | 
 
  | 
 
  | 
   | 
$  | 
(45,902  | 
)  | 
 
  
 
 
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