Increase in common stock capital shares reserved for future issuance.

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Share-based compensation arrangement by share-based payment award, additional number of shares available for grant.

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No definition available.

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The maximum annual increase in the number of shares reserved under the plan as a proportion of outstanding common stock.

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No definition available.

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Share based compensation arrangement by share based payment award maximum annual fair market value per employee.

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- Definition

Share based compensation arrangement by share based payment award maximum voting power of all classes of stock.

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Period from the Plan effective date that the Plan expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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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 share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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Discount rate from fair value on purchase date that participants pay for shares.

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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 equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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No definition available.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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- Definition

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 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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- Definition

The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

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Number of shares for which recognition of compensation cost was accelerated.

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No definition available.

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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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Number of options vested.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation - Additional Information (Details) - USD ($)	1 Months Ended						12 Months Ended
	Nov. 30, 2018	Oct. 31, 2018	Jun. 30, 2018	Feb. 28, 2018	Apr. 30, 2016	Mar. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding option awards							3,142,687	2,361,360
Stock option exercised							521,665
Tax benefits recognized							$ 0	$ 0	$ 0
Expected dividend yield							0.00%
RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vesting fair value							$ 200,000	$ 200,000	$ 300,000
Unrecognized stock-based compensation expense for RSAs							$ 0
Non-Employees \| RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of grant to non-employees							0	0	0
Number of vested shares							21,645	0	0
Employees and Non-Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognized for unvested employee and non-employee awards							$ 0	$ 0	$ 0
Employees and Non-Employees \| RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock issued										253,232
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incremental fair value of outstanding equity awards	$ 300,000
Director \| RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Modification of outstanding award	43,290
Director \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Modification of outstanding award	86,252
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average grant date fair value							$ 8.03	$ 5.22	$ 7.04
Stock option exercised									0
Intrinsic value of options exercised							$ 1,900,000	$ 300,000
Unrecognized stock-based compensation expense for options							$ 8,600,000
Weighted average period over which unrecognized compensation is expected to be recognized							2 years 8 months 12 days
Stock Options \| Non-Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option issued							0	0	0
Stock option vested							6,626	0	0
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, expiration period						10 years
Combined voting power of all classes of stock						10.00%
Option vesting, year						5 years
Number of common stock to option outstanding							268,716
Number of common stock available for issuance					509,869
2015 Equity Incentive Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of market value of common stock						100.00%
2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial reserves of common stock					1,100,000
Increase in number of shares of common stock reserved for issuance		1,759,602
Share based compensation plan expiration date		Aug. 07, 2028
Percentage of outstanding share of common stock		4.00%
Additional number of shares available for issuance												666,807	537,233
Total number of common stock reserved for issuance							4,750,902
Outstanding option awards							2,760,071
2016 Equity Incentive Plan \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional number of shares available for issuance											965,603
2018 Equity Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial reserves of common stock				1,100,000
Total number of common stock reserved for issuance							1,100,000
Outstanding option awards							113,900
2018 Plan, 2016 Plan and 2015 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, expiration period				10 years
2018 Plan, 2016 Plan and 2015 Plan \| Four Year Vesting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option vesting, year				4 years
2018 Plan, 2016 Plan and 2015 Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option vesting, year				4 years
2016 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock available for issuance							50,851
Percentage of outstanding share of common stock			1.00%
Total number of common stock reserved for issuance					165,000
Percentage of discount through payroll deductions to eligible employees to purchase common stock					15.00%
Percentage of fair market value of common stock					85.00%
Maximum number of shares permitted for per employee					2,000
Maximum purchase value per employee under employee stock purchase plan					$ 25,000
Employee stock purchase plan termination period					10 years
Expected dividend yield							0.00%	0.00%	0.00%
2016 Employee Stock Purchase Plan \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional number of shares available for issuance											241,400