Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Schedule of disaggregated revenue

	Years ended December 31,
	2020		2021
Project implementation phase:
Revenues from pre-production implementation projects	$	142,247	$	178,419
Revenues from post-production implementation projects		240,656		282,616
Total	$	382,903	$	461,035

Schedule of trade receivables, unbilled receivables, contract assets and contract liabilities

	December 31,
	2020		2021
Trade receivables (net of allowance for credit losses of $1,558 and $1,337 on December 31, 2020 and 2021, respectively)		48,623		53,985
Short-term unbilled receivables *)		9,301		16,072
Long-term unbilled receivables *)		772		858
Contract assets **)		7,485		6,988
Deferred revenues (short-term contract liabilities)		34,548		39,614
Long-term deferred revenues (long-term contract liabilities) ***)		524		299

*) Unbilled receivables relate to revenue recognized in excess of amounts invoiced as the Company has an unconditional right to invoice and receive payment in the future related to its fulfilled obligations.

**) Contract assets relate to unbilled receivables (including a long-term balance of $784 presented in other long-term assets as of December 31, 2021), which represent revenue recognized on arrangements for which billings have not yet been presented to customers because the amounts were earned but not contractually billable as of the balance sheet date, and the right to consideration is generally subject to milestone completion, client acceptance or factors other than the passage of time.

***) Included in other long-term liabilities in the consolidated balance sheets.