| Document and Entity Information | 6 Months Ended |
| Jun. 30, 2022 | |
| Cover Abstract | |
| Entity Registrant Name | ALLOT LTD. |
| Entity Central Index Key | 0001365767 |
| Document Type | 6-K |
| Document Period End Date | Jun. 30, 2022 |
| Amendment Flag | false |
| Document Fiscal Year Focus | 2022 |
| Current Fiscal Year End Date | --12-31 |
| Document Fiscal Period Focus | Q2 |
| Entity Address, Address Line One | 22 Hanagar Street |
| Entity Address, Address Line Two | Neve Ne'eman Industrial Zone B |
| Entity Address, City or Town | Hod-Hasharon |
| Entity Address, Postal Zip Code | 45240 |
| Entity Address, Country | IL |
| CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | ||
| Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | |
| Income Statement [Abstract] | ||||
| Revenues | $ 32,772 | $ 35,288 | $ 64,668 | $ 66,471 |
| Cost of revenues | 10,242 | 10,822 | 20,034 | 20,413 |
| Gross profit | 22,530 | 24,466 | 44,634 | 46,058 |
| Operating expenses: | ||||
| Research and development costs, net | 12,480 | 11,373 | 24,510 | 21,940 |
| Sales and marketing | 12,220 | 12,818 | 23,909 | 24,411 |
| General and administrative | 4,303 | 4,080 | 8,340 | 7,280 |
| Total operating expenses | 29,003 | 28,271 | 56,759 | 53,631 |
| Operating loss | (6,473) | (3,805) | (12,125) | (7,573) |
| Financial and other income, net | 620 | 194 | 867 | 309 |
| Loss before income tax expenses | (5,853) | (3,611) | (11,258) | (7,264) |
| Tax expenses | 380 | 368 | 1,102 | 673 |
| Net Loss | $ (6,233) | $ (3,979) | $ (12,360) | $ (7,937) |
| Basic net loss per share | $ (0.17) | $ (0.11) | $ (0.34) | $ (0.22) |
| Diluted net loss per share | $ (0.17) | $ (0.11) | $ (0.34) | $ (0.22) |
| Weighted average number of shares used in computing basic net loss per share (shares) | 36,827,197 | 35,941,378 | 36,684,017 | 35,739,556 |
| Weighted average number of shares used in computing diluted net loss per share (shares) | 36,827,197 | 35,941,378 | 36,684,017 | 35,739,556 |
| CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 |
| CURRENT ASSETS: | ||
| Cash and cash equivalents | $ 15,461 | $ 11,717 |
| Short-term bank deposits | 85,900 | 60,720 |
| Restricted deposits | 1,100 | 1,480 |
| Available-for-sale marketable securities | 5,319 | 11,531 |
| Trade receivables, net | 36,288 | 30,829 |
| Other receivables and prepaid expenses | 8,629 | 8,490 |
| Inventories | 12,256 | 11,092 |
| Total current assets | 164,953 | 135,859 |
| LONG-TERM ASSETS: | ||
| Long-term bank deposits | 215 | 215 |
| Severance pay fund | 369 | 407 |
| Operating lease right-of-use assets | 7,134 | 8,513 |
| Trade receivables, net | 5,991 | 6,643 |
| Other assets | 1,203 | 1,639 |
| Total long-term assets | 14,912 | 17,417 |
| PROPERTY AND EQUIPMENT, NET | 14,809 | 15,000 |
| GOODWILL AND INTANGIBLE ASSETS, NET | 34,668 | 35,138 |
| Total assets | 229,342 | 203,414 |
| CURRENT LIABILITIES: | ||
| Trade payables | 3,003 | 3,940 |
| Deferred revenues | 26,765 | 22,138 |
| Short-term operating lease liabilities | 2,722 | 2,785 |
| Other payables and accrued expenses | 26,073 | 26,250 |
| Total current liabilities | 58,563 | 55,113 |
| LONG-TERM LIABILITIES: | ||
| Deferred revenues | 12,444 | 15,942 |
| Long-term operating lease liabilities | 3,588 | 5,467 |
| Accrued severance pay | 866 | 884 |
| Convertible Debt | 39,475 | 0 |
| Total long-term liabilities | 56,373 | 22,293 |
| SHAREHOLDERS' EQUITY | 114,406 | 126,008 |
| Total liabilities and shareholders' equity | $ 229,342 | $ 203,414 |
| CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | ||
| Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | |
| Cash flows from operating activities: | ||||
| Net loss | $ (6,233) | $ (3,979) | $ (12,360) | $ (7,937) |
| Adjustments to reconcile net income to net cash used in operating activities: | ||||
| Depreciation | 1,332 | 1,141 | 2,746 | 2,229 |
| Stock-based compensation | 2,169 | 2,261 | 4,706 | 3,705 |
| Amortization of intangible assets | 235 | 234 | 470 | 471 |
| Increase (Decrease) in accrued severance pay, net | 26 | 12 | 20 | (60) |
| Decrease (increase) in other assets | 19 | (458) | 436 | 1,041 |
| Decrease in accrued interest and amortization of premium on marketable securities | 16 | 32 | 48 | 107 |
| Changes in operating leases, net | (191) | (479) | (563) | (711) |
| Increase in trade receivables | (4,082) | (3,113) | (4,807) | (10,256) |
| Decrease (Increase) in other receivables and prepaid expenses | 141 | 3,094 | (893) | 3,522 |
| Decrease (Increase) in inventories | 591 | 4,246 | (1,164) | 3,289 |
| Decrease in long-term deferred taxes, net | 0 | 103 | 0 | 175 |
| Increase (Decrease) in trade payables | (1,433) | 334 | (937) | (536) |
| Increase (decrease) in employees and payroll accruals | 523 | 1,286 | (1,963) | (623) |
| Increase in deferred revenues | 287 | 1,640 | 1,129 | 16,612 |
| Decrease in other payables, accrued expenses and other long term liabilities | (1,252) | (2,761) | (1,523) | (3,364) |
| Amortization of issuance costs of Convertible debt | 49 | 0 | 71 | 0 |
| Net cash provided by (used in) operating activities | (7,803) | 3,593 | (14,584) | 7,664 |
| Cash flows from investing activities: | ||||
| Decrease (increase) in restricted deposit | 260 | (2,440) | 380 | (2,874) |
| Redemption of (Investment in) short-term deposits | 520 | 100 | (25,180) | (24,200) |
| Purchase of property and equipment | (1,281) | (1,934) | (2,556) | (3,629) |
| Proceeds from redemption or sale of available-for sale marketable securities | 2,872 | 3,231 | 6,030 | 7,579 |
| Net cash provided by (used in) investing activities | 2,371 | (1,043) | (21,326) | (23,124) |
| Cash flows from financing activities: | ||||
| Proceeds from exercise of stock options | 15 | 908 | 250 | 2,467 |
| Issuance of convertible debt | 0 | 0 | 39,404 | 0 |
| Net cash provided by financing activities | 15 | 908 | 39,654 | 2,467 |
| Increase (Decrease) in cash and cash equivalents | (5,417) | 3,458 | 3,744 | (12,993) |
| Cash and cash equivalents at the beginning of the period | 20,878 | 7,148 | 11,717 | 23,599 |
| Cash and cash equivalents at the end of the period | $ 15,461 | $ 10,606 | $ 15,461 | $ 10,606 |
