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Selected Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
The following tables show a summary of the Company’s unaudited quarterly financial information for each of the four quarters of 2018 and 2017 (in thousands, except per share amounts):
 
Three Months Ended
 
December 31,
2018
 
September 29,
 2018
 
June 30,
2018
 
March 31,
2018
Revenue
$
571,199

 
$
393,575

 
$
299,344

 
$
247,865

Gross profit
$
216,927

 
$
153,514

 
$
119,015

 
$
114,123

Net income (loss)
$
15,372

 
$
(2,056
)
 
$
(118,268
)
 
$
(80,877
)
Net income (loss) per share attributable to common stockholders—basic
$
0.06

 
$
(0.01
)
 
$
(0.49
)
 
$
(0.34
)
Net income (loss) per share attributable to common stockholders—diluted
$
0.06

 
$
(0.01
)
 
$
(0.49
)
 
$
(0.34
)

 
Three Months Ended
 
December 31,
2017(3)
 
September 30,
 2017(2)
 
July 1,
2017
 
April 1,
2017(1)
Revenue
$
570,756

 
$
392,522

 
$
353,299

 
$
298,942

Gross profit
$
248,597

 
$
174,760

 
$
149,245

 
$
118,299

Net loss
$
(45,470
)
 
$
(113,403
)
 
$
(58,240
)
 
$
(60,079
)
Net loss per share attributable to common stockholders—basic
$
(0.19
)
 
$
(0.48
)
 
$
(0.25
)
 
$
(0.27
)
Net loss per share attributable to common stockholders—diluted
$
(0.19
)
 
$
(0.48
)
 
$
(0.25
)
 
$
(0.27
)


(1) 
During the first quarter of 2017, the Company recorded restructuring expenses of $6.3 million. See Note 5 for more information. In addition, the Company’s adoption of ASU 2016-09 on January 1, 2017 resulted in an increase to the provision for income taxes of $2.8 million. See Note 2 for more information.

(2) 
During the third quarter of 2017, as a result of one of the Company’s customers filing for bankruptcy, the Company recorded a net charge of $9.0 million comprised of net bad debt expense of $7.6 million and net cost of revenue of $1.4 million. See Note 1. Customer Bankruptcy for more information. In addition, during the third quarter of 2017, the Company recorded a $111.4 million valuation allowance against a portion of its U.S. deferred taxes.

(3) 
During the fourth quarter of 2017, as a result of the Tax Act, the Company recorded a provisional tax expense for the impact of the 2017 Tax Act of $45.5 million as a result of re-measurement of the federal portion of its deferred tax assets as of December 31, 2017 from 35% to the new 21% tax rate.