Common stock issuance description.

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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.

+ References

No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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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

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

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- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

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- Definition

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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- Definition

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

+ References

No definition available.

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Equity Incentive Plans - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended
	Jan. 01, 2019	Feb. 28, 2015	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Apr. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issuable increased during the period			3,182,868
Number of shares available for future grant			7,591,207		7,255,050
Number of options outstanding			11,790,706		8,986,010
Aggregate intrinsic value of options exercised			$ 700,000
Unrecognized compensation expense			$ 21,100,000
Weighted-average period of unrecognized compensation expense			3 years 2 months 12 days
Expected dividend yield				0.00%
Stock-based compensation related to options granted			$ 3,703,000	$ 4,924,000
Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation related to options granted			3,700,000	4,900,000
Non Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation			$ 25,000	$ 63,000
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of unrecognized compensation expense			2 years 10 months 24 days
Unrecognized stock-based compensation expense related to RSUs			$ 9,900,000
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of exercise price to fair market value common stock on grant date			100.00%
Stock option expiration period			10 years
2015 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares reserved for issuance						6,134,292
Percentage of shares issued on common stock outstanding			4.00%
Common Stock Issuance Description			shares issuable under the 2015 Plan to the lower of (i) 4% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year, or (ii) a lower number determined by the board of directors.
Shares issuable increased during the period	3,182,868
Number of shares available for future grant			7,591,207
2009 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issuable increased during the period		360,000
Number of options outstanding			3,187,042
2015 ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares reserved for issuance						720,000
Percentage of shares issued on common stock outstanding			1.00%
Common Stock Issuance Description			shares issuable under the 2015 ESPP equal to the lower of (i) 1% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year, or (ii) a lower number determined by the board of directors.
Shares issuable increased during the period	0
Number of shares available for future grant			1,681,668
Unrecognized compensation expense			$ 26,000
Weighted-average period of unrecognized compensation expense			1 month 6 days
More Than 10% Voting Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option expiration period			5 years
More Than 10% Voting Shares \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of exercise price to fair market value common stock on grant date			110.00%