Stock-Based Compensation - Stock Options and Restricted Stock Units Activity (Details)	9 Months Ended
Sep. 30, 2018 USD ($) shares
Stock Options
Stock-Based Compensation
Total unrecognized compensation expense \| $	$ 148,976
Weighted-average period expected to be recognized	8 months 12 days
Stock Options
Outstanding beginning of period (in shares)	1,430,962
Awards exercised/vested (in shares)	(295,129)
Awards canceled (in shares)	(5,875)
Outstanding end of period (in shares)	1,129,958
Restricted Stock Units
Stock-Based Compensation
Total unrecognized compensation expense \| $	$ 2,251,204
Weighted-average period expected to be recognized	2 years 4 months 24 days
Restricted Stock Units
Outstanding beginning of period (in shares)	252,733
Awards granted (in shares)	10,204
Awards exercised/vested (in shares)	(23,695)
Awards canceled (in shares)	(2,374)
Outstanding end of period (in shares)	236,868

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 options awarded to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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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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.

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

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Number of share options (or share units) exercised during the current period.

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