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Selected Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
(in thousands, except per share data)
2017
Total revenues
$
73,692

 
$
38,267

 
$
50,894

 
$
114,890

Gross profit (1)
$
48,499

 
$
18,826

 
$
29,690

 
$
59,127

Operating income (loss)
$
19,229

 
$
(11,027
)
 
$
(2,537
)
 
$
3,887

Net income (loss)
$
14,290

 
$
(11,842
)
 
$
(5,525
)
 
$
(5,088
)
Basic income (loss) per share
$
0.43

 
$
(0.35
)
 
$
(0.16
)
 
$
(0.15
)
Diluted income (loss) per share
$
0.42

 
$
(0.35
)
 
$
(0.16
)
 
$
(0.15
)
2016
Total revenues
$
50,321

 
$
39,133

 
$
49,341

 
$
52,808

Gross profit (1)
$
29,482

 
$
20,225

 
$
30,023

 
$
32,001

Operating income (2)
$
(3,460
)
 
$
(9,019
)
 
$
2,125

 
$
5,915

Net loss
$
(3,446
)
 
$
(7,840
)
 
$
(572
)
 
$
(1,950
)
Basic and diluted loss per share (3)
$
(0.11
)
 
$
(0.24
)
 
$
(0.02
)
 
$
(0.06
)
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
(in thousands, except per share data)
2017
Total revenues
$
73,692

 
$
38,267

 
$
50,894

 
$
114,890

Gross profit (1)
$
48,499

 
$
18,826

 
$
29,690

 
$
59,127

Operating income (loss)
$
19,229

 
$
(11,027
)
 
$
(2,537
)
 
$
3,887

Net income (loss)
$
14,290

 
$
(11,842
)
 
$
(5,525
)
 
$
(5,088
)
Basic income (loss) per share
$
0.43

 
$
(0.35
)
 
$
(0.16
)
 
$
(0.15
)
Diluted income (loss) per share
$
0.42

 
$
(0.35
)
 
$
(0.16
)
 
$
(0.15
)
2016
Total revenues
$
50,321

 
$
39,133

 
$
49,341

 
$
52,808

Gross profit (1)
$
29,482

 
$
20,225

 
$
30,023

 
$
32,001

Operating income (2)
$
(3,460
)
 
$
(9,019
)
 
$
2,125

 
$
5,915

Net loss
$
(3,446
)
 
$
(7,840
)
 
$
(572
)
 
$
(1,950
)
Basic and diluted loss per share (3)
$
(0.11
)
 
$
(0.24
)
 
$
(0.02
)
 
$
(0.06
)


(1)
Includes reclassification of $1.6 million, $1.7 million and $1.8 million from amortization of intangible assets from acquired business and technology to cost of sales expense for the first, second and third quarters, respectively, in the year ended December 31, 2017. Includes reclassification of $1.6 million, $1.6 million, $1.6 million and $1.7 million from amortization of intangible assets from acquired business and technology to cost of sales expense for the first, second, third and fourth quarters in the year ended December 31, 2016, respectively.
(2)
Includes reclassification of $0.7 million from amortization of intangible assets from acquired business and technology to sales and marketing expense for each of the first, second and third quarters in the year ended December 31, 2017. Includes reclassification of $0.6 million, $0.7 million, $0.7 million and $0.6 million from amortization of intangible assets from acquired business and technology to sales and marketing expense for the first, second, third and fourth quarters, respectively, in the year ended December 31, 2016.
(3)
Basic and diluted EPS amounts in each quarter are computed using the weighted-average number of shares outstanding during that quarter, while basic and diluted EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Therefore, the sum of the four quarters’ basic or diluted EPS may not equal the full year basic or diluted EPS.