Compensation, IPO Bonus Expense

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award. Number Of Installments

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

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

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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STOCK‑BASED COMPENSATION - Additional Information (Details)									12 Months Ended			22 Months Ended
	Jun. 05, 2017 shares	Mar. 22, 2017 shares	Mar. 16, 2017 USD ($) installment shares	Jul. 19, 2016 shares	Dec. 31, 2014	Dec. 01, 2013 installment shares	Sep. 30, 2013 $ / shares shares	Jun. 14, 2013 shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) installment $ / shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 $ / shares shares	Mar. 31, 2017 shares	Mar. 04, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)									793,738
Outstanding value of options (in dollars per share) \| $ / shares									$ 14.00
Forfeited (in shares)									5,148
Deferred IPO bonus expense \| $									$ 8,405,000
Granted (in dollars per share) \| $ / shares									$ 3.35	$ 1.77	$ 0.00
Options, outstanding, intrinsic value \| $									$ 69,400,000
Options, exercisable, intrinsic value \| $									64,500,000
Options, exercises in period, intrinsic value \| $									$ 2,300,000
Options, outstanding, weighted average remaining contractual term									6 years 10 months 18 days
Options, exercisable, weighted average remaining contractual term									6 years 4 months 24 days
Common stock, par value (in dollars per share) \| $ / shares							$ 0.001		$ 0.001	$ 0.001
Non-vested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share) \| $ / shares							$ 3.89
Target Shares Granted (in shares)		372,335					372,335		691,585
Restricted stock units, conversion of stock, conversion rights (in shares)							1
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Shares Granted (in shares)									169,635
Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)														4,645,884
Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)												3,499,228
Outstanding value of options (in dollars per share) \| $ / shares												$ 3.96
Expiration period					10 years
Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)													5,800,000
Compensation cost not yet recognized, period for recognition									2 years 7 months 17 days
Tax benefit from compensation expense \| $									$ 9,500,000	$ 1,600,000	$ 1,200,000
Compensation not yet recognized, stock options \| $									6,800,000
Incentive Award Plan \| Non-vested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $									6,200,000	0	0
Target Shares Granted (in shares)	319,250
Restricted stock units, conversion of stock, conversion rights (in shares)	1
Compensation not yet recognized, other than options \| $									$ 3,300,000
Compensation cost not yet recognized, period for recognition									2 years 6 months
Incentive Award Plan \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $									$ 400,000	0	0
June 14, 2013 \| Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)								2,799,408
Expiration period								10 years
Award vesting rights								25.00%
Stock-based compensation \| $									$ 700,000	1,200,000	1,200,000
December 1, 2013 \| Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)						699,820
Expiration period						10 years
Forfeited (in shares)									114,456
Deferred IPO bonus expense \| $			$ 5,100,000
Number of installments \| installment						4
July 19, 2016 \| Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)				1,274,549
Expiration period				10 years
Stock-based compensation \| $									$ 1,800,000	$ 400,000	0
Number of installments \| installment										5
March 16, 2017 \| Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)			793,738
Expiration period			10 years
Stock-based compensation \| $									$ 500,000	$ 0	$ 0
Number of installments \| installment			4