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Stock-Based Compensation - Stock Options and Restricted Stock Units Activity (Details)	6 Months Ended
	Jun. 30, 2019 USD ($) shares
Stock Options
Stock-Based Compensation
Total unrecognized compensation expense | $	$ 19,208
Weighted-average period expected to be recognized	4 months 24 days
Stock Options
Outstanding beginning of period (in shares)	1,129,463
Awards exercised/vested (in shares)	(179,638)
Awards cancelled (in shares)	(750)
Outstanding end of period (in shares)	949,075
Restricted Stock Units
Stock-Based Compensation
Total unrecognized compensation expense | $	$ 2,494,518
Weighted-average period expected to be recognized	2 years 6 months
Restricted Stock Units
Outstanding beginning of period (in shares)	226,501
Awards granted (in shares)	8,780
Awards exercised/vested (in shares)	(32,964)
Awards cancelled (in shares)	(13,246)
Outstanding end of period (in shares)	189,071

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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.

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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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