Aggregate grant date fair value of shares vested.

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- Definition

Cancellation period for vested options upon termination of employee.

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Service period for stock options granted to employees.

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- Definition

Aggregate number of common shares reserved for future issuance.

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

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

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.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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- Definition

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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- 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.

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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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Percentage of vesting of share-based compensation awards.

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Stock Options - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	2,021,543	1,987,682
Weighted average grant-date fair value of options granted	$ 3.97	$ 6.02	$ 1.23
Stock options vested aggregate intrinsic value	$ 2,485,258	$ 3,596,624	$ 7,770,086
Stock options expected to vest aggregate intrinsic value	$ 993,372	$ 1,469,154	$ 4,569,243
Total grant date fair value of shares vested	2,770,008	322,804	176,597
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans	$ 2,781,062	$ 2,453,342	$ 522,818
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans, period for recognition	3 years
Restricted Stock \| Chief Financial Officer And Chief Operating Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock granted			57,475
Fair value of common stock granted, per share			$ 2.00
Vested percentage of common stock		100.00%
Restricted Stock Units [Member] \| Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock granted	3,962
Fair value of common stock granted, per share	$ 12.62
Restricted stock units, vesting period description	shares vest equally on each of the anniversaries over a three-year period.
Restricted stock units, vesting period	3 years
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period for stock options granted to employees	1 year
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period for stock options granted to employees	4 years
Authorized for Grants under the 2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	463,491	633,052
Rolled from 2013 Equity Incentive Plan to 2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	0
Authorized for Grants under the 2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	0	0
Common stock authorized under equity incentive plan				1,200,000
Vested options cancellation days, after termination of employee			90 days