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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2020	Jan. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares issued for employee stock purchase plan (“ESPP”) (in shares)	215,057	125,893	340,950	389,284
ESPP expense			$ 0.4	$ 0.6	$ 0.5
Employee Stock Purchase Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair market value at grant purchase price			85.00%
Fair market value at grant exercise price			85.00%
Common stock, reserved for future issuance (in shares)			3,000,000.0
Common stock, shares available for future issuance (in shares)			1,800,000

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Aggregate number of common shares reserved for future issuance.

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

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