Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Statutory federal rate	21.00%	21.00%	21.00%
Increase (Decrease) in valuation allowance	$ 5,600	$ (345)	$ 567
U.S. federal net operating loss carryforwards	66,900
Foreign operating loss carryforwards	27,000
Foreign withholding tax	228	638	5,590
Unrecognized tax benefits including interest and penalties	2,000	2,500
Unrecognized tax benefits that would impact effective rate	1,600	2,200
Unrecognized tax benefits reduction to non-current deferred income tax assets	627	230
Reduction of uncertain tax benefits related to certain liabilities for unrecognized tax benefits	307	307
Accrued interest and penalties	276	366
Income tax penalties and interest expense	(90)	$ (7)	$ 69
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefit in next twelve months	250
Domestic
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforward, expiring	41,700
Operating loss carryforward, no expiration	$ 25,200
Period to utilize the net operating loss carryforwards	15 years
NOL carryforward used in period	$ 23,700
Foreign
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforward, expiring	1,200
Operating loss carryforward, no expiration	$ 25,800