Summary of Significant Accounting Policies - Allowance For Doubtful Accounts Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts receivable [Roll Forward]
Beginning balance	$ 2,390	$ 2,334
(Subtractions) additions	131	(657)
Deductions (write-offs/recoveries) from reserve	(612)	(319)
Ending balance	1,589	2,390
Allowance, net of FX
Allowance for doubtful accounts receivable [Roll Forward]
(Subtractions) additions	$ (189)	$ 375