Stock Plans - ESPP FV Assumptions (Details) - ESPP - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based compensation
Cash proceeds	$ 3.1	$ 3.1	$ 2.6
Number of shares issued	395,941	332,096	163,000
Assumptions
Weighted average fair value (in dollars per share)	$ 2.96	$ 4.94	$ 7.09
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Expected volatility factor (as a percent)	60.00%	62.00%	36.00%
Risk-free interest rate (as a percent)	2.41%	1.81%	0.99%
Expected life (in years)	6 months	6 months	6 months

Amount of cash inflow from issuance of shares under share-based payment arrangement. Excludes option exercised.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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

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