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QUARTERLY RESULTS (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2018
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
2018
 
2017
 
Dec. 31
 
Sept. 30
 
June 30
 
Mar. 31
 
Dec. 31
 
Sept. 30
 
June 30
 
Mar. 31
Net revenues (1)
$
112,684

 
$
104,046

 
$
98,615

 
$
97,937

 
$
107,258

 
$
105,265

 
$
102,373

 
$
104,107

Cost of revenues
44,220

 
41,485

 
40,333

 
40,280

 
46,862

 
42,957

 
40,670

 
38,598

Amortization of intangible assets
1,950

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

Gross profit
66,514

 
60,611

 
56,332

 
55,707

 
58,446

 
60,358

 
59,753

 
63,559

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Research and development
14,836

 
15,873

 
15,985

 
15,685

 
16,308

 
16,025

 
16,991

 
18,888

   Marketing and selling
23,921

 
23,461

 
27,759

 
26,132

 
25,776

 
25,652

 
29,018

 
25,811

   General and administrative
13,574

 
13,660

 
14,041

 
13,955

 
10,624

 
15,193

 
13,644

 
14,431

   Amortization of intangible assets
361

 
363

 
363

 
363

 
362

 
362

 
363

 
363

   Restructuring costs (recoveries), net
1,747

 
226

 
268

 
2,907

 
595

 
(582
)
 
6,063

 
983

   Total operating expenses
54,439

 
53,583

 
58,416

 
59,042

 
53,665

 
56,650

 
66,079

 
60,476

Operating income (loss)
12,075

 
7,028

 
(2,084
)
 
(3,335
)
 
4,781

 
3,708

 
(6,326
)
 
3,083

Interest and other expense, net
(5,725
)
 
(5,725
)
 
(6,278
)
 
(5,359
)
 
(5,203
)
 
(4,701
)
 
(3,918
)
 
(4,846
)
Income (loss) before income taxes
6,350

 
1,303

 
(8,362
)
 
(8,694
)
 
(422
)
 
(993
)
 
(10,244
)
 
(1,763
)
Provision for (benefit from) income taxes
447

 
425

 
144

 
255

 
459

 
(1,065
)
 
587

 
152

Net income (loss)
$
5,903

 
$
878

 
$
(8,506
)
 
$
(8,949
)
 
$
(881
)
 
$
72

 
$
(10,831
)
 
$
(1,915
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) per share – basic and diluted
$
0.14

 
$
0.02

 
$
(0.20
)
 
$
(0.22
)
 
$
(0.02
)
 
$
0.00

 
$
(0.26
)
 
$
(0.05
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
41,860

 
41,792

 
41,587

 
41,404

 
41,216

 
41,133

 
40,953

 
40,772

Weighted-average common shares outstanding – diluted
42,430

 
42,226

 
41,587

 
41,404

 
41,216

 
41,355

 
40,953

 
40,772