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Stockholders' Equity - Employee Stock Purchase Plan (Details) - USD ($) $ in Thousands			3 Months Ended
	Jan. 01, 2021	Jan. 01, 2020	Mar. 31, 2021	Mar. 31, 2020	Apr. 27, 2017
Stockholders' Equity
Stock-based compensation expense			$ 2,457	$ 2,728
Employee Stock Purchase Plan
Stockholders' Equity
Purchase price of common stock under plan (as a percent)			85.00%
Offering period (in months)			6 months
Shares reserved			1,782,422		1,600,000
Incremental share increase (in shares)			500,000
Incremental share increase (as a percent)			1.00%
Increase in number of shares reserved and available for issuance	194,518	190,539
Stock-based compensation expense			$ 300	$ 200

X

- Definition

Period which an employee's right to purchase shares of stock at a discount, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Represents the minimum increase in shares on an annual basis.

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- Definition

Represents the incremental annual share percentage increase minimum.

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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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.

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- Definition

Aggregate number of common shares reserved for future issuance.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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

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