Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value	$ 4.26	$ 5.01
Issuance of common stock, stock purchase plan, shares	1,450,236
Shares available for issuance	2,149,764
Stock-based compensation	$ 7,526	$ 8,048
Property and Equipment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 100	100
2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	4,000,000
Percentage of outstanding stock	4.00%
Options expiration period	10 years
2013 Equity Incentive Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted price per share percent	100.00%
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of options vested, total	$ 1,400	$ 1,300
Unrecognized stock based compensation	$ 49,400
Unrecognized stock based compensation, amortized weighted average period	2 years 8 months 15 days
2013 Employee Stock Purchase Plan ("ESPP")
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum contribution of base compensation for employee stock purchase plan	15.00%
Offering period of employee stock purchase plan	6 months
Purchase price of common stock percentage of fair market value	85.00%
Stock Based Compensation Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation	$ 66,200
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation	$ 16,800
Unrecognized stock based compensation, amortized weighted average period	3 years 1 month 6 days

Employee stock purchase plan maximum contribution of base compensation through payroll.

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Share based compensation arrangement by share based payment award number of shares available for issuance under ESPP.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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