Income Taxes - Summary of Valuation Allowance Activity (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of the beginning of period	$ 1,673	$ 32,455	$ 13,839
Additions charged to expense	504	0	16,743
Deletions credited to expense	(4)	(28,733)	0
Currency translation and other balance sheet activity	(1,290)	(2,049)	1,873
Balance as of the end of period	$ 883	$ 1,673	$ 32,455