GOODWILL AND OTHER INTANGIBLES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Goodwill [Roll Forward]
Carrying amount, December 31, 2018			$ 26,679
Goodwill attributable to acquisitions (subject to change)			503
Foreign currency adjustments			8
Carrying amount, June 30, 2019	$ 27,190		27,190
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	11,900		11,900		$ 11,503
Accumulated amortization	(2,374)		(2,374)		(1,739)
Net carrying amount	9,526		9,526		9,764
Amortization expense	305	$ 97	607	$ 194
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019 (remaining)	666		666
2020	1,287		1,287
2021	1,283		1,283
2022	1,265		1,265
2023	918		918
Thereafter	4,107		4,107
Net carrying amount	9,526		9,526		9,764
Developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	8,200		8,200		8,200
Accumulated amortization	(410)		(410)		0
Net carrying amount	7,790		7,790		8,200
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net carrying amount	7,790		7,790		8,200
Customer relationships and other
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	3,700		3,700		3,303
Accumulated amortization	(1,964)		(1,964)		(1,739)
Net carrying amount	1,736		1,736		1,564
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Net carrying amount	$ 1,736		$ 1,736		$ 1,564