INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									$ 400	$ 300
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	$ 1,900								$ 1,900		1,800
Reconciliation of Income Tax Provision to Statutory Tax Rate [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount									530	(1,975)	(4,698)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount									815	1,277	1,646
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount									921	1,854	3,113
Effective Income Tax Rate Reconciliation, Tax Contingency, Uncertain Tax Positions									11,185	58	800
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount									2,474	301	1,109
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount									(21,001)	(244)	1,455
Provision for (benefit from) income taxes	(5,231)	$ (283)	$ 0	$ 438	$ 447	$ 425	$ 144	$ 255	(5,076)	1,271	133
Income (loss) from operations before income taxes:
United States									4,311	(1,940)	(4,811)
Foreign									(1,786)	(7,463)	(8,611)
Total income from operations before income taxes	10,139	2,882	(10,723)	225	6,350	1,303	(8,362)	(8,694)	2,525	(9,403)	(13,422)
Current tax expense (benefit):
Net cash payments for income taxes									(783)	(2,791)	(100)
Federal									(4)	(1)	(4)
State									58	59	59
Foreign benefit of net operating losses									(462)	(206)	(66)
Other foreign									1,632	1,372	1,774
Total current tax expense (benefit)									1,224	1,224	1,763
Deferred tax (benefit) expense:
Federal									0	0	(821)
Other foreign									(6,300)	47	(809)
Total deferred tax (benefit) expense									(6,300)	47	(1,630)
Provision for (benefit from) income taxes	(5,231)	$ (283)	$ 0	$ 438	447	$ 425	$ 144	$ 255	(5,076)	1,271	133
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
ValuationAllowanceDeferredTaxAssetChangeInAmount									1,500
Increases for tax positions taken during a prior period									11,248		800
Decreases for tax positions taken during a prior period										(78)
Unrecognized tax benefits at end of period	13,011				$ 1,763				13,011	$ 1,763	$ 1,841
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations									129,400
Deferred Tax Assets, Tax Credit Carryforwards	$ 800								$ 800