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Restructuring Charges - Narrative (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2017 position	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 97	$ 589	$ 1,047
Restructuring reserve, acrual adjustment		0	18
Workforce Reduction Costs | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	55
Restructuring charges		97	253
Restructuring reserve, acrual adjustment		0	0
Lease Termination and Other Costs | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	19
Restructuring reserve, acrual adjustment		0	0
Lease Termination and Other Costs | 2015 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	317
Restructuring reserve, acrual adjustment		0	$ 18
Accounting Standards Update 2016-02
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, acrual adjustment		302
Accounting Standards Update 2016-02 | Workforce Reduction Costs | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, acrual adjustment		0
Accounting Standards Update 2016-02 | Lease Termination and Other Costs | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, acrual adjustment		0
Accounting Standards Update 2016-02 | Lease Termination and Other Costs | 2015 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, acrual adjustment		$ 302

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- Definition

The number of positions eliminated during the period as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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