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QUARTERLY RESULTS (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results (Unaudited)
The following information has been derived from unaudited consolidated financial statements that, in the opinion of management, include all normal recurring adjustments necessary for a fair presentation of such information.
(In thousands, except per share data)
Quarter Ended
2017
 
2016
 
Dec. 31
 
Sept. 30
 
June 30
 
Mar. 31
 
Dec. 31
 
Sept. 30
 
June 30
 
Mar. 31
Net revenues
$
107,258

 
$
105,265

 
$
102,373

 
$
104,107

 
$
115,295

 
$
119,019

 
$
134,069

 
$
143,547

Cost of revenues
46,862

 
42,957

 
40,670

 
38,598

 
43,876

 
41,678

 
44,320

 
41,533

Amortization of intangible assets
1,950

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

Gross profit
58,446

 
60,358

 
59,753

 
63,559

 
69,469

 
75,391

 
87,799

 
100,064

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Research and development
16,308

 
16,025

 
16,991

 
18,888

 
18,773

 
19,953

 
21,433

 
21,405

   Marketing and selling
25,776

 
25,652

 
29,018

 
25,811

 
21,311

 
27,231

 
30,177

 
31,619

   General and administrative
10,624

 
15,193

 
13,644

 
14,431

 
13,112

 
13,822

 
16,818

 
17,719

   Amortization of intangible assets
362

 
362

 
363

 
363

 
363

 
567

 
782

 
786

   Restructuring costs (recoveries), net
595

 
(582
)
 
6,063

 
983

 
4,959

 
5,314

 
(213
)
 
2,777

   Total operating expenses
53,665

 
56,650

 
66,079

 
60,476

 
58,518

 
66,887

 
68,997

 
74,306

Operating income (loss)
4,781

 
3,708

 
(6,326
)
 
3,083

 
10,951

 
8,504

 
18,802

 
25,758

Other expense, net
(5,203
)
 
(4,701
)
 
(3,918
)
 
(4,846
)
 
(4,622
)
 
(4,707
)
 
(5,159
)
 
(4,183
)
(Loss) income before income taxes
(422
)
 
(993
)
 
(10,244
)
 
(1,763
)
 
6,329

 
3,797

 
13,643

 
21,575

Provision for (benefit from) income taxes
459

 
(1,065
)
 
587

 
152

 
1,108

 
(5,321
)
 
703

 
635

Net (loss) income
$
(881
)
 
$
72

 
$
(10,831
)
 
$
(1,915
)
 
$
5,221

 
$
9,118

 
$
12,940

 
$
20,940

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net (loss) income per share – basic and diluted
$
(0.02
)
 
$
0.00

 
$
(0.26
)
 
$
(0.05
)
 
$
0.13

 
$
0.23

 
$
0.33

 
$
0.53

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
41,216

 
41,133

 
40,953

 
40,772

 
40,637

 
40,194

 
39,678

 
39,566

Weighted-average common shares outstanding – diluted
41,216

 
41,355

 
40,953

 
40,772

 
40,746

 
40,476

 
39,734

 
39,640