Additional stock repurchase program authorized amount.

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- Definition

Common stock for future issuance number increase.

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No definition available.

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- Definition

Common stock for future issuance percentage increased.

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No definition available.

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- Definition

A description of the time periods when employees can make stock purchases at a discounted rate.

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No definition available.

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- Definition

Employees contribution on earnings.

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- Definition

The cash inflow from issuance of preferred stocks identified as being convertible, net of issuance costs.

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No definition available.

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- Definition

Payment of underwriting discounts and commissions.

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- Definition

Percentage of shares vested under performance target.

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No definition available.

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- Definition

performance target assumption grant date fair value.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value.

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No definition available.

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Share based compensation arrangement by Share based payment award equity instruments other than options grants percentage.

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No definition available.

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Shares reserved for future issuance expressed as a percentage of outstanding shares.

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No definition available.

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- Definition

Percentage ownership by stockholders.

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No definition available.

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Stockholders Equity Note Stock Split Ratio.

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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No definition available.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

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No definition available.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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Discount rate from fair value on offering date that participants pay for shares.

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Discount rate from fair value on purchase date that participants pay for shares.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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

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No definition available.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Change in the weighted average exercise price of options outstanding.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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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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- Definition

Per share or per unit amount of equity securities issued.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Stockholders' Equity - Additional Information (Details) - USD ($)						1 Months Ended					3 Months Ended	12 Months Ended
	Jan. 01, 2015	Mar. 31, 2014	Mar. 26, 2014	Jun. 01, 2009	Jun. 07, 2005	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2014	Dec. 31, 2013	Aug. 31, 2013	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 29, 2015	Nov. 30, 2014	May. 31, 2014	Dec. 31, 2009
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total aggregate shares of common stock after conversion							38,065,708
Aggregate offering price													$ 217,796,000
Term of stock options												4 years
Weighted-average grant-date fair value of stock options granted												$ 12.73	$ 7.18	$ 4.11
Total fair value of options vested												$ 12,200,000	$ 7,500,000	$ 4,000,000
Total intrinsic value of options exercised												53,300,000	35,100,000	52,600,000
Cash received from options exercised												7,300,000	$ 2,200,000	$ 7,100,000
Unrecognized compensation expense of options, net of forfeitures											$ 13,900,000	$ 13,900,000
Unrecognized compensation expense, expected to be recognized over a weighted-average period												2 years 2 months 9 days
Shares withheld for taxes and not issued												35,379	80,599	809,012
Employee stock purchase plans, purchased shares												272,836
Number of shares repurchased												1,895,625	490,419
Value of shares repurchased												$ 48,364,000	$ 15,009,000	$ 3,342,000
Additional stock repurchase program authorized amount															$ 50,000,000	$ 30,000,000
Stock repurchase remained available for future repurchase, value											$ 31,600,000	31,600,000
Stock-based compensation expense												17,923,000	10,960,000	6,113,000
Income tax benefit recognized relating to stock-based compensation expense												5,700,000	2,000,000	4,400,000
Actual tax benefit realized from stock options exercised												$ 19,600,000	$ 13,500,000	19,900,000
Dividends paid to holder of preferred and common stock														$ 357,520,000
Dividend paid to holder of preferred stock									$ 33,300,000
Dividend paid to holder of common stock									$ 13,400,000
Exercise prices on outstanding options											$ 8.96	$ 8.96	$ 6.13
Stock split ratio													200.00%
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility rate												39.00%	58.00%	48.00%
Stock Option \| Awards vesting a year from grant date for non employee director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting percentage												33.00%
Restricted Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense, expected to be recognized over a weighted-average period												3 years 18 days
Total grant date fair value of restricted stock units granted											$ 31,200,000
Total grant date fair value of restricted stock units												$ 3,500,000	$ 100,000	$ 100,000
Unrecognized compensation expense of awards other than options, net of forfeitures											23,300,000	$ 23,300,000
Dividends declared per share									$ 0.88	$ 5.88				$ 0.88
Dividends, share-based compensation										$ 100,000
Restricted Stock Unit \| Awards vesting a year from grant date for newly hired employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting percentage												25.00%
Restricted Stock Unit \| Awards vesting during each quarter after first year for newly hired employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting percentage												6.25%
Restricted Stock Unit \| Remaining awards vesting during each quarter
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting percentage												6.25%
Performance-based restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense, expected to be recognized over a weighted-average period												2 years
Unrecognized compensation expense of awards other than options, net of forfeitures											$ 800,000	$ 800,000
Performance-based restricted stock units \| Share-based compensation award, tranche one
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period						12 months
Performance-based restricted stock units \| Share-based compensation award, tranche two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period						24 months
Performance-based restricted stock units \| Share-based compensation award, tranche three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period						36 months
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ownership, less than 10%											10.00%	10.00%
Minimum \| Performance-based restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting percentage range						0.00%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contractual term												5 years
Stock repurchase program, authorized amount																	$ 15,000,000
Maximum \| Performance-based restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting percentage range						200.00%
Total grant date fair value of restricted stock units granted												$ 5,800,000.0
Performance target assumption, grant date fair value												200.00%
Member of board of directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial public offering shares issued and sold (in shares)								91,074
Public offering share price								$ 10.98
Aggregate offering price								$ 1,000,000
Member of board of directors \| Restricted Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of stock options												1 year
Nonemployee directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted percentage of fair market value												110.00%
Nonemployee directors \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contractual term												10 years
Executives \| Performance-based restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of stock options						3 years
Percentage of long term incentive compensation award grants						33.30%
2000 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, additional number of shares available for grant											0	0
2009 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future issuance expressed as a percentage of outstanding shares												4.50%
Number of shares reserved for issuance	3,141,509
2009 Plan \| Nonemployee directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan description												The 2009 Plan, as amended, provides that the number of shares reserved for issuance under the 2009 Plan will increase on January 1 of each year for a period of up to five years by 4.5% of the total number of shares of capital stock outstanding on December 31 of the preceding calendar year, which will begin on January 1, 2015 and continue through January 1, 2019.
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares reserved for issuance			1,100,000.0
Common stock for future issuance percentage increased			1.00%
Authorized shares reserved for issuance	698,113
Stock options granted percentage of fair market value on offering date			85.00%
Stock options granted percentage of fair market value on purchase date			85.00%
Employee stock purchase plan offering periods												Offering periods are six months in duration and will end on or about May 15 and November 15 of each year, with the exception of the initial offering period, which commenced on March 26, 2014 and ended on November 14, 2014.
Employee stock purchase plans, purchased share values												$ 5,300,000
Employee Stock Purchase Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employees contribution on earnings			1.00%
Employee Stock Purchase Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock for future issuance number increase			1,800,000
Employees contribution on earnings			15.00%
IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Offering expenses		$ 5,600,000
Initial public offering shares issued and sold (in shares)		15,000,000
Public offering share price		$ 16					$ 16
Aggregate offering price		$ 240,000,000
Proceeds from issuance initial public offering, net of underwriting discounts and commissions		216,800,000
Underwriting discounts and commissions		$ 16,800,000
First Offering \| Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Public offering share price											$ 25.25	$ 25.25
Second Offering \| Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Public offering share price											$ 15.71	$ 15.71
Series G Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Convertible preferred stock, shared issued					5,391,441
Convertible preferred stock, per share					$ 11.00
Aggregate cash purchase price					$ 59,300,000
Offering expenses					200,000
Issuance costs					$ 59,100,000
Series H Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Convertible preferred stock, shared issued				4,124,986
Convertible preferred stock, per share				$ 16.69
Aggregate cash purchase price				$ 68,800,000
Offering expenses				5,000,000
Issuance costs				$ 63,800,000
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial public offering shares issued and sold (in shares)													15,091,074
Aggregate offering price													$ 217,796,000
Shares withheld for taxes and not issued												35,379	80,599	809,012
Employee stock purchase plans, purchased shares												272,836	249,494
Number of shares repurchased												1,895,625	490,419	407,728
Dividends declared per share									$ 0.88	$ 5.88				$ 0.88
Dividends payable, date of record									Dec. 25, 2013	Aug. 30, 2013
Dividends paid to holder of preferred and common stock										$ 87,100,000
Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividends declared per share									$ 0.88	$ 5.88				0.88
Dividends payable, date of record									Dec. 25, 2013	Aug. 21, 2013
Dividends paid to holder of preferred and common stock										$ 223,600,000
Adjusted Exercise Price Option Six
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Adjustment to exercise prices on outstanding options										$ (5.88)
Adjusted Exercise Price Option Seven
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices on outstanding options										0.50
Adjusted Exercise Price Option Eight
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Adjustment to exercise prices on outstanding options									$ (0.88)
Adjusted Exercise Price Option Nine
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices on outstanding options									$ 0.50					$ 0.50
Exercise Price Range2
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices on outstanding options										$ 6.38
Exercise Price Range3
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices on outstanding options																		$ 1.38
Exercise Price Range4
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices on outstanding options																		$ 2.75