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Stockholders' Equity - Stock options outstanding and exercisable (Details)	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Stockholders' Equity
Number of options outstanding | shares	2,310,485
Options outstanding, Weighted average remaining contractual life (Years)	6 years 3 months 15 days
Options outstanding, Weighted average exercise price (in dollars per share) | $ / shares	$ 4.81
Options outstanding, Aggregate intrinsic value | $	$ 747,653
Number of options exercisable | shares	1,752,657
Options exercisable, Weighted average remaining contractual life (Years)	5 years 5 months 12 days
Options exercisable, Weighted average exercise price (in dollars per share) | $ / shares	$ 5.69
Options exercisable, Aggregate intrinsic value | $	$ 181,143

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=116856206&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&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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- Definition

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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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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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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