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Restructuring Charges - Accrual For Restructuring Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 448	$ 265
Restructuring charges	97	589	$ 1,047
Cash payments	(221)	(388)
Write-offs	0	(18)
Ending Balance	22	448	265
2017 Restructuring Plan | Workforce Reduction Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	146	44
Restructuring charges	97	253
Cash payments	(221)	(151)
Write-offs	0	0
Ending Balance	22	146	44
2017 Restructuring Plan | Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0
Restructuring charges	0	19
Cash payments	0	(19)
Write-offs	0	0
Ending Balance	0	0	0
2015 Restructuring Plan | Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	302	221
Restructuring charges	0	317
Cash payments	0	(218)
Write-offs	0	(18)
Ending Balance	0	$ 302	$ 221
Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
Write-offs	(302)
Accounting Standards Update 2016-02 | 2017 Restructuring Plan | Workforce Reduction Costs
Restructuring Reserve [Roll Forward]
Write-offs	0
Accounting Standards Update 2016-02 | 2017 Restructuring Plan | Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Write-offs	0
Accounting Standards Update 2016-02 | 2015 Restructuring Plan | Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Write-offs	$ (302)

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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- Definition

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

+ References

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