Employee Stock Purchase Plan, Number of Interim Purchase Periods

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General duration of employee stock purchase plan.

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Increase in common stock shares reserved for future issuance percentage.

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No definition available.

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- Definition

IRS Limitation for an employee's right to acquire class common stock under ESPP.

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- Definition

Share based compensation arrangement by share based payment award evergreen shares.

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- Definition

Share based compensation arrangement by share based payment award look back feature period.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Increase in Number of Shares Authorized, Ratio

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Target, Percentage

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

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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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

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.

+ References

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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- Definition

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

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- Definition

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

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- Definition

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

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No definition available.

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STOCK-BASED COMPENSATION Narrative (Details)					3 Months Ended	12 Months Ended
STOCK-BASED COMPENSATION Narrative (Details)	Jan. 31, 2019 shares	May 18, 2017 shares	May 01, 2017 shares	Mar. 29, 2012 shares	Jun. 30, 2018 $ / shares shares	Dec. 31, 2018 USD ($) purchase_period $ / shares shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, outstanding (in shares)						6,772,000	8,426,000	8,730,000	8,170,000
Total unrecognized compensation cost \| $						$ 17,100,000
Weighted-average recognition period for unrecognized compensation cost						2 years 6 months
Common stock to be purchased in exchange for options (in shares)						521,000	4,379,000	1,505,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target percentage					0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target percentage					150.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock to be purchased in exchange for options (in shares)			2,362,470
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award granted (in shares)					1,440,000	1,477,000
Weighted average estimated fair value of award (in usd per share) \| $ / shares					$ 4.57	$ 4.65
Performance Shares with Market Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award granted (in shares)					720,000
Weighted average estimated fair value of award (in usd per share) \| $ / shares					$ 4.54
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock to be purchased in exchange for options (in shares)			733,559
Two Thousand Six Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting period						4 years
Share-based compensation, weighted-average remaining contractual term						10 years
Share-based compensation, outstanding (in shares)						1,600,000
Two Thousand and Eleven Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting period						4 years
Share-based compensation, shares authorized (in shares)						2,643,171
Increase in common stock shares reserved for future issuance percentage						4.50%
Share-based compensation, shares available for grant (in shares)						1,319,960
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, shares authorized (in shares)				669,603
Share-based compensation, shares available for grant (in shares)						551,203
Share-based compensation, additional shares authorized (in shares)		400,000
Share-based compensation, Evergreen shares (in shares)		700,000		330,396
Share-based compensation, increase in number of shares authorized				1.00%
Employee stock purchase plan, number of interim purchase periods \| purchase_period						4
General duration of employee stock purchase plan						24 months
Share-based compensation, maximum employee subscription rate						15.00%
Share-based compensation, purchase price of common stock percent to fair market value						85.00%
Share-based compensation, look-back feature (in years)						2 years
IRS limitation for employees right to acquire class common stock under ESPP \| $						$ 25,000
Before August 1, 2012 \| Two Thousand and Eleven Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, weighted-average remaining contractual term						10 years
After August 1, 2012 \| Two Thousand and Eleven Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, weighted-average remaining contractual term						7 years
Subsequent Event \| Two Thousand and Eleven Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, additional shares authorized (in shares)	4,816,556
Subsequent Event \| Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, Evergreen shares (in shares)	700,000