ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Expenses And Other Current Liabilities Details Abstract
Accrued payroll and related costs	$ 24,049	$ 20,662
Accrued vacation	8,285	6,639
Labor union contribution	1,315	2,089
Deferred revenue	1,683	1,652
American governmental payroll support program	4,347
Other	3,391	3,991
Total accrued expenses and other current liabilities	$ 43,070	$ 35,033

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Amount of expenses American government payroll support program.

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Carrying amount of labor union contribution as of the balance sheet date, due within one year or within the normal operating cycle if longer.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for unused vacation time owed to employees based on the entity's vacation benefit given to its employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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