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Stockholders' Equity - Components of Share-Based Compensation Expense (Details) - shares	Dec. 31, 2017	Dec. 31, 2016	Oct. 06, 2014	Oct. 03, 2013	Oct. 10, 2012	Oct. 14, 2011	Jan. 18, 2011	Jun. 02, 2010	Oct. 29, 2009	May 09, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	(209,818)
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares, outstanding (shares)	9,483,911	8,205,790
Stock Options [Member] | 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (shares)			899,500	599,500	45,000	237,500	177,500	137,500	97,500	38,000
Stock Options [Member] | Non US Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (shares)					57,000
2015 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2015 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	(3,835)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	0
Shares Expired	(314,254)
Common stock, shares authorized (shares)	440,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	(634,577)
Common stock, shares, outstanding (shares)	42,498
2009 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	(8,093)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	(156,467)
Shares Expired	(302,024)
Common stock, shares authorized (shares)	899,500
Common Stock, Capital Shares Reserved for Future Issuance	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	(432,916)
Common stock, shares, outstanding (shares)	0
2003 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2003 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	(925)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	(8,922)
Shares Expired	(10,147)
Common stock, shares authorized (shares)	25,000
Common Stock, Capital Shares Reserved for Future Issuance	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	(5,006)
Common stock, shares, outstanding (shares)	0
Evergreen 2016 [Member] | 2015 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2015 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	226,932
Evergreen 2017 [Member] | 2015 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2015 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	328,232

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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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