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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of Convertible Preferred Stock

The authorized, issued and outstanding shares of convertible preferred stock and liquidation preferences as of December 31, 2017 were as follows:

	Shares				Per share price at issuance				Aggregate liquidation preference				Dividend per share amount
	Authorized		Outstanding
Series A	63.9		63.9		$	0.09			$	6.0			$	0.02
Series A-1	52.0		51.9		0.03				1.3				0.02
Series B	19.5		19.5		13.58				264.8				1.08
Series C	15.8		12.3		$	28.65			352.6				$	2.30
	151.2		147.6						$	624.7

Schedule of Stock Option and Restricted Stock Activity

Stock option and restricted stock activity for the Plans was as follows for the years ended December 31, 2018, 2017, and 2016:

				Options outstanding									Restricted stock outstanding
	Number of shares available for issuance under the Plans			Number of shares outstanding under the Plans			Weighted- average exercise price per share				Weighted- average remaining contractual term (In years)		Number of Plan shares outstanding			Weighted- average grant date fair value per share
Balance at December 31, 2015	14.6			13.4			$	17.51			8.1		43.5			$	17.67
Options and RSUs canceled	14.1			(8.0	)		22.04						(6.1	)		20.06
Restricted stock granted	(16.6	)		—			—						16.6			15.59
Balance at December 31, 2016	12.1			5.4			$	10.68			6.5		54.0			$	16.41
Additional shares authorized	6.7			—			—						—			—
Options exercised and RSUs released	—			(0.1	)		6.00						(14.6	)		17.12
Options and RSUs canceled	6.2			(0.3	)		17.44						(6.0	)		17.96
Shares repurchased for tax withholdings on release of restricted stock	5.5			—			—						—			17.09
Restricted stock granted	(21.5	)		—			—						21.5			15.70
Balance at December 31, 2017	9.0			5.0			$	10.52			5.5		54.9			$	15.60
Reserved for issuance under the 2018 Plan	41.4			—			$	—					—			$	—
Additional shares authorized	1.3			—			$	—					—			$	—
Options exercised and RSUs released	—			(3.4	)		$	7.75					(40.4	)		$	15.42
Options and RSUs canceled	6.0			(0.3	)		$	22.90					(5.7	)		$	16.78
Shares repurchased for tax withholdings on release of restricted stock	15.6			—			$	—					—			$	15.45
Restricted stock granted	(16.2	)		—			$	—					16.2			$	20.26
Balance at December 31, 2018	57.1			1.3			$	14.68			5.0		25.0			$	18.68
Vested at December 31, 2018				1.3			$	14.68					—			$	—
Unvested at December 31, 2018				—			$	—					25.0			$	18.68

Schedule of Pre-Tax Intrinsic Value

The following table summarizes information about the pre-tax intrinsic value of options exercised and the weighted-average grant date fair value per share of options granted during the years ended December 31, 2018, 2017, and 2016:

		Year ended December 31,
		2018				2017				2016
Intrinsic value of options exercised		$	59.0			$	1.2			$	—

X

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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