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Organization and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedules of Percentage of Total Revenues and Accounts Receivable by Customer

The following table sets forth the percentages of total revenue or gross accounts receivable for customers that represent 10% or more of the respective amounts for the periods shown:

	Revenue									Gross Accounts Receivable
	Twelve Months Ended December 31,									As of December 31,
	2019			2018			2017			2019			2018
Distributor A	17	%		15	%		16	%		21	%		19	%
Distributor B	12	%		12	%		14	%		*			15	%
Distributor C	10	%		*			*			*			*

* Less than 10%

Schedule of Revenue Recognized as a Result of Changes in Contract Liability Balances

The table below shows revenue that we recognized as a result of changes in the contract liability balances in the periods shown.

	Twelve Months Ended December 31,
(In millions)	2019				2018
Revenue recognized in the period from:
Amounts included in contract liabilities at the beginning of the period	$	2.6			$	1.9

Schedule of Basic and Diluted Net Income (Loss) Per Share

The following table sets forth the computation of basic and diluted net income (loss) per share for the periods shown.

		Twelve Months Ended December 31,
(In millions)		2019				2018				2017
Net income (loss)		$	101.1			$	(127.1	)		$	(50.2	)
Net income (loss) per common share
Basic		$	1.11			$	(1.44	)		$	(0.58	)
Diluted		$	1.10			$	(1.44	)		$	(0.58	)
Basic weighted average shares outstanding		91.1				88.2				86.3
Dilutive potential common stock outstanding:
Stock options and employee stock purchase plan		—				—				—
Restricted stock units		1.2				—				—
2023 Warrants		—				—				—
2022 senior convertible notes		—				—				—
2023 senior convertible notes		—				—				—
Diluted weighted average shares outstanding		92.3				88.2				86.3

Schedule of Outstanding Anti-Dilutive Securities Excluded in Diluted Net Income (Loss) per Share

Outstanding anti-dilutive securities not included in the diluted net income (loss) per share attributable to common stockholders calculations were as follows:

	Twelve Months Ended December 31,
(In millions)	2019			2018			2017
Options outstanding to purchase common stock	—			0.1			0.4
Unvested restricted stock units	0.2			2.7			2.7
2023 Warrants	5.2			5.2			—
Senior convertible notes due 2022	4.0			4.0			4.0
Senior convertible notes due 2023	5.2			5.2			—
Total	14.6			17.2			7.1

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Tabular disclosure of contract balances and changes in contract balances.

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