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Stock-Based Compensation, Information about Stock Options Outstanding (Details) - Stock Options [Member]	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Information about Stock Options Outstanding [Abstract]
Options outstanding, number outstanding (in shares) | shares	5,630,021
Options outstanding, weighted average remaining contractual life	6 years 1 month 10 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 8.49
Options vested and exercisable, number exercisable (in shares) | shares	4,079,687
Options vested and exercisable, weighted average remaining contractual life	5 years 3 months 25 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	$ 10.10
$2.35 - 6.95 [Member]
Information about Stock Options Outstanding [Abstract]
Exercise price range, lower range limit (in dollars per share)	2.35
Exercise price range, upper range limit (in dollars per share)	$ 6.95
Options outstanding, number outstanding (in shares) | shares	4,376,396
Options outstanding, weighted average remaining contractual life	7 years 29 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.29
Options vested and exercisable, number exercisable (in shares) | shares	2,826,062
Options vested and exercisable, weighted average remaining contractual life	6 years 5 months 23 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	$ 4.31
$14.52 - 35.25 [Member]
Information about Stock Options Outstanding [Abstract]
Exercise price range, lower range limit (in dollars per share)	14.52
Exercise price range, upper range limit (in dollars per share)	$ 35.25
Options outstanding, number outstanding (in shares) | shares	1,253,625
Options outstanding, weighted average remaining contractual life	2 years 8 months 16 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 23.16
Options vested and exercisable, number exercisable (in shares) | shares	1,253,625
Options vested and exercisable, weighted average remaining contractual life	2 years 8 months 16 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	$ 23.16

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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