Represents the exercise period under share-based arrangement.

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Amount of difference between fair values of the underlying shares reserved for issuance and exercise price of options vested during the period.

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Represents the exercise period under share-based arrangement applicable to stockholder owning to more than ten percent of the entity common stock.

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No definition available.

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Represents the percentage of ownership in the entity common stock required for specified stock options exercise price.

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Represents the exercise price of options as a percentage of grant date fair value of common stock applicable to stockholder owning to more than ten percent of the entity common stock.

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No definition available.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Exercise price per share or per unit of warrants or rights outstanding.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Purchase price of common stock expressed as a percentage of its fair value.

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Employee Stock Benefit Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	4,834,255	5,462,787
Grant date fair value (in dollars per share)	$ 12.97	$ 18.69	$ 22.74
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, outstanding (in shares)	0	120,532	605,415
Employee Stock Purchase Plan \| Employee stock purchase plan / 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	1,473,247
Deferred compensation liability	$ 0.8
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	5,684,071
Options outstanding (in shares)	4,834,255
Aggregate intrinsic value of options vested during the period	$ 4.2	$ 9.1
Total unrecognized compensation expense	$ 25.1
Weighted average period over which unrecognized compensation is expected to be recognized	2 years 4 months 28 days
Options to purchase common stock \| Long Term Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent purchase price of common stock	100.00%
Percent purchase price of common stock applicable to stockholders owning more than ten percent of the entity common stock	110.00%
Percentage of ownership in entity common stock required for specified exercise price	10.00%
Exercise period	10 years
Exercise period applicable to stockholders owning more than ten percent of the entity common stock	5 years
Award vesting period	4 years
Options to purchase common stock \| Stock option / 2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent purchase price of common stock	100.00%
Percent purchase price of common stock applicable to stockholders owning more than ten percent of the entity common stock	110.00%
Percentage of ownership in entity common stock required for specified exercise price	10.00%
Exercise period	10 years
Exercise period applicable to stockholders owning more than ten percent of the entity common stock	5 years
Award vesting period	4 years
Options to purchase common stock \| Stock Option and Incentive Plan 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent purchase price of common stock	100.00%
Percent purchase price of common stock applicable to stockholders owning more than ten percent of the entity common stock	110.00%
Percentage of ownership in entity common stock required for specified exercise price	10.00%
Exercise period	10 years
Exercise period applicable to stockholders owning more than ten percent of the entity common stock	5 years
Award vesting period	4 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share)	$ 20.04
Total unrecognized compensation expense	$ 9.8
Weighted average period over which unrecognized compensation is expected to be recognized	2 years 6 months 18 days
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share)	$ 19.20
Number of shares authorized (in shares)	79,000
Minimum \| Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants or rights (in dollars per share)		$ 14.00
Maximum \| Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants or rights (in dollars per share)		$ 16.97