Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2018		252,362,841
Beginning balance at Dec. 31, 2018	$ 735,938	$ 25	$ 1,055,046	$ (66)	$ (319,067)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		2,381,188
Issuance of common stock	931		931
Stock-based compensation expense	20,669		20,669
Taxes related to net share settlement of restricted stock units	6,422		6,422
Net income (loss)	(79,465)				(79,465)
Other comprehensive income	162			162
Ending balance (in shares) at Mar. 30, 2019		254,744,029
Ending balance at Mar. 30, 2019	671,813	$ 25	1,070,224	96	(398,532)
Beginning balance (in shares) at Dec. 31, 2019		264,883,426
Beginning balance at Dec. 31, 2019	487,263	$ 26	1,126,827	188	(639,778)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		1,923,573
Issuance of common stock	458		458
Stock-based compensation expense	18,863		18,863
Taxes related to net share settlement of restricted stock units	5,868		5,868
Net income (loss)	20,294				20,294
Other comprehensive income	45			45
Ending balance (in shares) at Apr. 04, 2020		266,806,999
Ending balance at Apr. 04, 2020	$ 521,055	$ 26	$ 1,140,280	$ 233	$ (619,484)