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

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other tan options vested and expected to vest outstanding number.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Share-based compensation arrangement by share-based payment award, nonvested awards, lowest potential aggregate fair values.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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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.

+ References

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- Definition

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

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

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

+ References

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-Name Accounting Standards Codification
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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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- Definition

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

+ References

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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).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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- Definition

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

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- Definition

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

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.

+ References

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

+ References

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- Definition

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

+ References

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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.

+ References

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- Definition

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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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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- Definition

Net number of share options (or share units) granted during the period.

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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

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

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- Definition

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

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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

The number of employees affected by the modification of an equity-based compensation plan.

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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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.

+ References

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

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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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Share/Stock-Based Compensation - Additional Information (Details)		1 Months Ended	12 Months Ended
	Mar. 10, 2015 Employee shares	Apr. 30, 2016 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Jan. 01, 2018 shares	Jan. 01, 2017 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares forfeited			556,275
Number of vested and unvested shares of restricted common stock converted	253,232
Number of vested and unvested shares of option to purchase common stock converted	100,446		2,351,832
Entity number of employees \| Employee	7
Outstanding option awards			2,361,360	1,146,935
Stock option exercised			200,600
Tax benefits recognized \| $				$ 0	$ 0	$ 0
Lowest potential aggregate fair values of unvested awards \| $			$ 0	0	0
Expected dividend yield			0.00%
Non-Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense recognized for unvested non-employee awards \| $			$ 0	$ 0	$ 0
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average grant date fair value \| $ / shares			$ 5.22	$ 7.04	$ 3.48
Stock option exercised				0
Intrinsic value of options exercised \| $			$ 319,000		$ 25,000
Stock option issued				0
Stock option vested				0
Unrecognized stock-based compensation expense for options \| $			$ 5,500,000
Weighted average period over which unrecognized compensation is expected to be recognized			2 years 6 months
Stock Options \| Non-Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option issued			0		25,387
Stock option vested			0		11,279
Unvested Restricted Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of unvested stock outstanding			33,307	75,932
Number of vested shares			42,206
RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vesting fair value \| $			$ 219,000	$ 258,000	$ 933,000
Unrecognized stock-based compensation expense for RSAs \| $			$ 11,000
Weighted average period over which unrecognized compensation is expected to be recognized			7 months 6 days
RSAs \| Non-Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Granted			0	0	61,096
Number of vested shares					32,588
RSAs \| Employees and Non-Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock issued					253,232
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			348,965
Number of common stock available for issuance		509,869
2015 Equity Incentive Plan \| Minimum [Member]
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
Percentage of outstanding share of common stock			4.00%
Additional number of shares available for issuance								537,233
2016 Equity Incentive Plan \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional number of shares available for issuance							666,807
2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total number of common stock reserved for issuance			2,311,802
Outstanding option awards			2,012,395
2016 Plan and 2015 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, expiration period		10 years
Expected dividend yield			0.00%	0.00%	0.00%
2016 Plan and 2015 Plan \| Four Year Vesting
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option vesting, year		4 years
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			106,765
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%
Stock option to purchase an aggregate of common stock shares			58,235
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%
Class B Common
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, less forfeitures	355,156
Shares forfeited	1,474