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QUARTERLY RESULTS (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2019
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
2019
 
2018
 
Dec. 31
 
Sept. 30
 
June 30
 
Mar. 31
 
Dec. 31
 
Sept. 30
 
June 30
 
Mar. 31
Net revenues
$
116,306

 
$
93,461

 
$
98,701

 
$
103,319

 
$
112,684

 
$
104,046

 
$
98,615

 
$
97,937

Cost of revenues
43,033

 
35,603

 
40,253

 
40,087

 
44,220

 
41,485

 
40,333

 
40,280

Amortization of intangible assets
—

 
—

 
1,788

 
1,950

 
1,950

 
1,950

 
1,950

 
1,950

Gross profit
73,273

 
57,858

 
56,660

 
61,282

 
66,514

 
60,611

 
56,332

 
55,707

Operating expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Research and development
16,018

 
14,860

 
15,180

 
16,285

 
14,836

 
15,873

 
15,985

 
15,685

   Marketing and selling
26,603

 
22,334

 
26,129

 
24,878

 
23,921

 
23,461

 
27,759

 
26,132

   General and administrative
14,816

 
12,034

 
12,722

 
13,788

 
13,574

 
13,660

 
14,041

 
13,955

   Amortization of intangible assets
—

 
—

 
331

 
363

 
361

 
363

 
363

 
363

   Restructuring costs (recoveries), net
113

 
229

 
(269
)
 
558

 
1,747

 
226

 
268

 
2,907

   Total operating expenses
57,550

 
49,457

 
54,093

 
55,872

 
54,439

 
53,583

 
58,416

 
59,042

Operating income (loss)
15,723

 
8,401

 
2,567

 
5,410

 
12,075

 
7,028

 
(2,084
)
 
(3,335
)
Interest and other expense, net
(5,584
)
 
(5,519
)
 
(13,290
)
 
(5,185
)
 
(5,725
)
 
(5,725
)
 
(6,278
)
 
(5,359
)
Income (loss) before income taxes
10,139

 
2,882

 
(10,723
)
 
225

 
6,350

 
1,303

 
(8,362
)
 
(8,694
)
Provision for (benefit from) income taxes
(5,231
)
 
(283
)
 
—

 
438

 
447

 
425

 
144

 
255

Net income (loss)
$
15,370

 
$
3,165

 
$
(10,723
)
 
$
(213
)
 
$
5,903

 
$
878

 
$
(8,506
)
 
$
(8,949
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) per share – basic
$
0.36

 
$
0.07

 
$
(0.25
)
 
$
(0.01
)
 
$
0.14

 
$
0.02

 
$
(0.20
)
 
$
(0.22
)
Net income (loss) per share – diluted
$
0.35

 
$
0.07

 
$
(0.25
)
 
$
(0.01
)
 
$
0.14

 
$
0.02

 
$
(0.20
)
 
$
(0.22
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
43,060

 
42,913

 
42,560

 
42,046

 
41,860

 
41,792

 
41,587

 
41,404

Weighted-average common shares outstanding – diluted
43,737

 
43,674

 
42,560

 
42,046

 
42,430

 
42,226

 
41,587

 
41,404