Annual Increases in number of shares available for issuance.

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

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Employee stock purchase plan maximum percentage of market value purchase price.

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Offering period of employee stock purchase plan.

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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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Share based compensation arrangement by share based payment award shares available for issuance increase decrease stock split.

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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

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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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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- Definition

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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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value		$ 6.59	$ 6.44
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%
Issuance of common stock, stock purchase plan, shares	825,848
Shares available for issuance	1,974,152	1,974,152
Stock-based compensation		$ 7,796	$ 7,756
Property and Equipment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation		$ 100	100
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in the number of shares available for issuance description		(i) 0.5% of outstanding common stock on the last day of the immediately preceding year, (ii) 400,000 shares, or (iii) such number determined by the Board of Directors.
Scenario One \| Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of outstanding stock		0.50%
Scenario Two \| Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual increases in number of shares available for issuance	400,000	400,000
2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	4,000,000	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		$ 2,400	$ 2,300
Unrecognized stock based compensation	$ 62,900	$ 62,900
Unrecognized stock based compensation, amortized weighted average period		2 years 11 months 15 days
Stock Based Compensation Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation	77,200	$ 77,200
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation	$ 14,300	$ 14,300
Unrecognized stock based compensation, amortized weighted average period		2 years 11 months 4 days