INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									$ 0	$ 400
Enacted Corporate Tax									35.00%
New Enacted Corporate Tax Rate									21.00%
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Unrecognized tax benefits including the impact of penalties and interest											$ 1,800
Unrecognized tax benefits that would impact effective tax rate											1,800
Reconciliation of Income Tax Provision to Statutory Tax Rate [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount									$ 2,611	530	(1,975)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount									1,356	815	1,277
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount									981	921	1,854
Effective Income Tax Rate Reconciliation, Tax Contingency, Uncertain Tax Positions									(474)	11,185	58
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount									425	2,474	301
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount									3,527	21,001	244
Provision for (benefit from) income taxes	$ (174)	$ 707	$ 717	$ 122	$ (5,231)	$ (283)	$ 0	$ 438	1,372	(5,076)	1,271
Income (loss) from operations before income taxes:
United States									9,182	4,311	(1,940)
Foreign									3,252	(1,786)	(7,463)
Total income from operations before income taxes	6,913	8,694	2,562	(5,735)	10,139	2,882	(10,723)	225	12,434	2,525	(9,403)
Current tax expense (benefit):
Net cash payments for income taxes									(391)	783	(2,791)
Federal									0	(4)	(1)
State									133	58	59
Foreign benefit of net operating losses									(883)	(462)	(206)
Other foreign									1,295	1,632	1,372
Total current tax expense (benefit)									545	1,224	1,224
Deferred tax (benefit) expense:
Federal									0	0	0
Other foreign									827	(6,300)	47
Total deferred tax (benefit) expense									827	(6,300)	47
Provision for (benefit from) income taxes	(174)	$ 707	$ 717	$ 122	(5,231)	$ (283)	$ 0	$ 438	1,372	(5,076)	1,271
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Increases for tax positions taken during a prior period										11,248
Decreases for tax positions taken during a prior period									(818)		(78)
Unrecognized tax benefits at end of period	12,193				$ 13,011				12,193	13,011	$ 1,763
Deferred Tax Assets, Tax Credit Carryforwards	$ 800								800
Foreign [Member]
Reconciliation of Income Tax Provision to Statutory Tax Rate [Abstract]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount										12,600
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount									$ 1,500
Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount										11,100
Net Operating Loss Carryforward Irish Subsidiary | Foreign [Member]
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount										$ 6,000