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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 1,480	$ 916
Operating lease, impairment loss	$ 200
Restructuring Liability | 2017 Restructuring Plan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment of lease obligations	300	$ (273)
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 2,900

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Amount of loss from impairment of right-of-use asset from operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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