Stock-Based Compensation - Employee Stock Purchase Plan (Details) - Employee stock purchase plan - USD ($)	1 Months Ended	12 Months Ended
May 31, 2017	Dec. 31, 2019
Stock-based compensation additional disclosures
Maximum amount that employees may contribute through payroll deductions	$ 25,000
Percentage of the fair value market price on the first day of the offering period or on the day of purchase	85.00%
Shares reserved for issuance	500,000
Shares available for grant		232,671
Common shares purchased		98,425
Proceeds from the issuance of common stock		$ 3,100,000

Represents the highest amount out of annual salary that an employee is permitted to utilize with respect to the plan.

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Amount of cash inflow from issuance of shares under share-based payment arrangement. Excludes option exercised.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901

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- Definition

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.

+ References

No definition available.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

Number of shares purchased for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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