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Stockholders' Equity - Summary of Stock Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (shares) | shares	7,694,870
Weighted-Average Remaining Contractual Life (in Years)	6 years 6 months 27 days
Weighted average exercise price ($ per share)	$ 6.77
Options exercisable (shares) | shares	5,444,771
Weighted-average exercise price ($ per share)	$ 6.68
$1.48-$3.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	1.48
Exercise price, upper range limit	$ 3
Options outstanding (shares) | shares	1,177,183
Weighted-Average Remaining Contractual Life (in Years)	4 years 6 months 27 days
Weighted average exercise price ($ per share)	$ 2.25
Options exercisable (shares) | shares	1,177,183
Weighted-average exercise price ($ per share)	$ 2.25
$3.01-$6.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	3.01
Exercise price, upper range limit	$ 6
Options outstanding (shares) | shares	753,932
Weighted-Average Remaining Contractual Life (in Years)	3 years 4 months 9 days
Weighted average exercise price ($ per share)	$ 4.64
Options exercisable (shares) | shares	668,244
Weighted-average exercise price ($ per share)	$ 4.57
$6.01-$9.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	6.01
Exercise price, upper range limit	$ 9
Options outstanding (shares) | shares	4,709,442
Weighted-Average Remaining Contractual Life (in Years)	7 years 6 months 25 days
Weighted average exercise price ($ per share)	$ 7.09
Options exercisable (shares) | shares	2,639,454
Weighted-average exercise price ($ per share)	$ 7.23
$9.01-$12.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	9.01
Exercise price, upper range limit	$ 12
Options outstanding (shares) | shares	357,603
Weighted-Average Remaining Contractual Life (in Years)	8 years 1 day
Weighted average exercise price ($ per share)	$ 9.79
Options exercisable (shares) | shares	263,180
Weighted-average exercise price ($ per share)	$ 9.83
$12.01-$15.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	12.01
Exercise price, upper range limit	$ 15
Options outstanding (shares) | shares	696,710
Weighted-Average Remaining Contractual Life (in Years)	6 years 2 months 20 days
Weighted average exercise price ($ per share)	$ 12.96
Options exercisable (shares) | shares	696,710
Weighted-average exercise price ($ per share)	$ 12.96

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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.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

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

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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.

+ References

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