Total combined voting power of all classes of stock.

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Employee Common Stock Purchases Through Payroll Deductions Under Employee Stock Purchase Plan Price As Percentage Of Eligible Compensation

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Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved For Future Issuance Increase Percentage

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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

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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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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 addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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

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Equity Incentive Plans and Stock-Based Compensation - 2014 Equity Incentive Plan/ESPP (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 10, 2015	Oct. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised				$ 2,778	$ 1,930	$ 2,629
2014 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)				10,725,127
Expiration period				5 years
2014 Stock Incentive Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period				10 years
Vesting period				4 years
2014 Stock Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of exercise price of fair value per share on grant date				110.00%
2014 Stock Incentive Plan \| Minimum \| Non-Statutory Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of exercise price of fair value per share on grant date				100.00%
2014 Stock Incentive Plan \| Minimum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
2014 Stock Incentive Plan \| Minimum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
2014 Stock Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares reserved for future issuance (in shares)		8,000,000
Percentage of outstanding shares of common stock		5.00%
Combined voting power of all classes of stock				10.00%
2014 Stock Incentive Plan \| Maximum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
2014 Stock Incentive Plan \| Maximum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
2014 Employee Stock Purchase Plan \| ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of eligible compensation	15.00%
Offering period	24 months
Amended 2014 Employee Stock Purchase Plan \| ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)				1,821,186
Percentage of eligible compensation			10.00%
Offering period			6 months
Percentage of market value				85.00%
Maximum number of shares per employee (in shares)				1,500
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased (in shares)				581,634	662,362
Price per share (in dollars per share)				$ 5.67	$ 5.14
Intrinsic value of options exercised				$ 1,000	$ 800