Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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).

+ References

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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Gross number of share options (or share units) granted during the period.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 2
-Subparagraph (a)(2)
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The number of inducement share options granted during the period.

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No definition available.

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Represents the threshold amount of authorized share-base compensation shares to be increased under the 2014 Plan.

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No definition available.

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Represents the threshold percentage of common stock outstanding for an increase in the number of authorized shares available for issuance under the 2014 Plan.

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No definition available.

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Stock-Based Compensation - Stock Based Compensation Narrative (Details) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Stock options
Stock-Based Compensation
Granted as an inducement grant (in shares)		150,000
Exercise price (in dollars per share)	$ 3.98	$ 10.22	$ 10.49
2014 Plan
Stock-Based Compensation
Shares authorized for grant		2,450,000
Threshold increase of authorized shares for issuance		1,500,000
Threshold increase of authorized shares for issuance (as a percent)		10.00%
Shares available for issuance		195,668
2014 Plan \| Stock options
Stock-Based Compensation
Contractual life (in years)		10 years
Options granted (in shares)		135,000	1,110,806
Executive Officer and Certain Consultants \| 2014 Plan \| Stock options
Stock-Based Compensation
Options granted (in shares)	542,550
Exercise price (in dollars per share)	$ 3.98
Executive Officer and Certain Consultants \| 2014 Plan \| Stock options \| Upon closing of IPO
Stock-Based Compensation
Vesting percentage	25.00%
Executive Officer and Certain Consultants \| 2014 Plan \| Stock options \| Period following closing of IPO
Stock-Based Compensation
Vesting period	3 years
Executive Officer and Certain Consultants \| 2014 Plan \| Restricted stock
Stock-Based Compensation
Shares granted	579,882
Executive Officer and Certain Consultants \| 2014 Plan \| Restricted stock \| Upon closing of IPO
Stock-Based Compensation
Vesting percentage	25.00%
Executive Officer and Certain Consultants \| 2014 Plan \| Restricted stock \| Period following closing of IPO
Stock-Based Compensation
Vesting period	3 years
Employees and Board Of Directors
Stock-Based Compensation
Granted as an inducement grant (in shares)		150,000
Employees and Board Of Directors \| Stock options
Stock-Based Compensation
Options granted (in shares)		285,000
Employees and Board Of Directors \| 2014 Plan \| Stock options
Stock-Based Compensation
Options granted (in shares)			1,001,977
Board of Directors \| Stock options
Stock-Based Compensation
Vesting period		1 year
Board of Directors \| 2014 Plan \| Stock options
Stock-Based Compensation
Vesting percentage			33.00%
Vesting period			3 years
Employees \| Stock options
Stock-Based Compensation
Vesting percentage		25.00%
Vesting period		3 years
Employees \| Stock options \| Upon closing of IPO
Stock-Based Compensation
Vesting percentage			6.25%
Employees \| 2014 Plan \| Stock options
Stock-Based Compensation
Vesting percentage			25.00%
Vesting period			3 years