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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- Definition

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

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Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost capitalized for award under share-based payment arrangement.

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- Definition

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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- Definition

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

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No definition available.

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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

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

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No definition available.

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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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- Definition

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

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No definition available.

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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 Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	0		1,150,178
Weighted average grant date fair value (in USD per share)		$ 3.56	$ 4.26	$ 4.34
Issuance of common stock, stock purchase plan (in shares)			1,667,810
Shares available for issuance (in shares)	1,932,190		1,932,190
Unrecognized stock based compensation	$ 61.2		$ 61.2
Share-based compensation capitalized	$ 0.1	$ 0.2	$ 0.3	$ 0.4
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)	4,000,000		4,000,000
Percentage of outstanding stock			4.00%
Options expiration period			10 years
2013 Equity Incentive Plan \| Maximum
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	$ 2.5	$ 1.7	$ 5.4	$ 4.7
Unrecognized stock based compensation	48.2		$ 48.2
Unrecognized stock based compensation, amortized weighted average period			2 years 9 months 29 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 Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock based compensation	$ 13.0		$ 13.0
Unrecognized stock based compensation, amortized weighted average period			2 years 8 months 8 days