CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance (in shares) at Dec. 31, 2016		145,021
Beginning balance at Dec. 31, 2016	$ 762,328	$ 145	$ 1,354,082	$ (28,324)	$ (563,575)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	196	196
Stock options exercised	$ 1,525		1,525
ESPP shares issued (in shares)		2,140
ESPP shares issued	16,411	$ 2	16,409
Shares withheld for tax obligations (in shares)		(110)
Shares withheld for tax obligations	(1,034)		(1,034)
Restricted stock units released (in shares)		2,224
Restricted stock units released		$ 2	(2)
Issuance of common stock related to acquisition	0
Stock-based compensation	46,063		46,063
Other comprehensive income (loss)	34,578			34,578
Net loss	(194,506)				(194,506)
Balance (in shares) at Dec. 30, 2017		149,471
End of period at Dec. 30, 2017	$ 665,365	$ 149	1,417,043	6,254	(758,081)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	229	229
Stock options exercised	$ 1,701		1,701
ESPP shares issued (in shares)		2,189
ESPP shares issued	15,992	$ 2	15,990
Shares withheld for tax obligations (in shares)		(109)
Shares withheld for tax obligations	(1,144)		(1,144)
Restricted stock units released (in shares)		2,697
Restricted stock units released		$ 3	(3)
Issuance of common stock related to acquisition (in shares)		20,975
Issuance of common stock related to acquisition	129,628	$ 21	129,607
Stock-based compensation	42,905		42,905
Conversion option related to convertible senior notes, net of allocated costs	128,726		128,726
Capped call	(48,909)		(48,909)
Other comprehensive income (loss)	(31,554)			(31,554)
Net loss	(214,295)				(214,295)
Balance (in shares) at Dec. 29, 2018		175,452
End of period at Dec. 29, 2018	$ 703,821	$ 175	1,685,916	(25,300)	(956,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	0
ESPP shares issued (in shares)		2,897
ESPP shares issued	$ 12,052	$ 3	12,049
Shares withheld for tax obligations (in shares)		(98)
Shares withheld for tax obligations	(425)		(425)
Restricted stock units released (in shares)		2,883
Restricted stock units released		$ 3	(3)
Issuance of common stock related to acquisition	0
Stock-based compensation	43,347		43,347
Other comprehensive income (loss)	(9,339)			(9,339)
Net loss	(386,618)				(386,618)
Balance (in shares) at Dec. 28, 2019		181,134
End of period at Dec. 28, 2019	$ 386,535	$ 181	$ 1,740,884	$ (34,639)	$ (1,319,891)