Stockholders' Equity - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 04, 2020 USD ($) $ / shares shares
Number of Shares Subject to Stock Options
Balance, beginning of period (in shares) | shares	12,871
Granted (in shares) | shares	0
Exercised (in shares) | shares	(220)
Forfeited or canceled (in shares) | shares	(6)
Balance, end of period (in shares) | shares	12,645
Stock options vested and expected to vest (in shares) | shares	12,645
Stock options exercisable (in shares) | shares	12,645
Weighted– Average Exercise Price
Balance, weighted average exercise price, beginning of period (in dollars per share) | $ / shares	$ 3.51
Granted, weighted average exercise price (in dollars per share) | $ / shares	0
Exercised, weighted average exercise price (in dollars per share) | $ / shares	2.08
Forfeited or canceled, weighted average exercise price (in dollars per share) | $ / shares	7.37
Balance, weighted average exercise price, end of period (in dollars per share) | $ / shares	3.53
Stock options vested and expected to vest (in dollars per share) | $ / shares	3.53
Stock options exercisable (in dollars per share) | $ / shares	$ 3.53
Aggregate Intrinsic Value | $	$ 40,349
Stock options vested and expected to vest | $	40,349
Stock options exercisable | $	$ 40,349