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INVENTORIES | 12 Months Ended
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Dec. 31, 2020
INVENTORIES |
INVENTORIES | NOTE 4 - INVENTORIES
| a. | Inventories at December 31, 2019 and 2020 consisted of the following:
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) | ​ | 2019 | ​ | 2020
Raw materials | ​ | $ | 3,607 | ​ | $ | 3,347
Work in progress | ​ |  | 552 | ​ | ​ | 2,887
Finished goods | ​ |  | 3,996 | ​ | ​ | 6,848
Total inventory | ​ | $ | 8,155 | ​ | $ | 13,082
​ b. During the years ended December 31, 2018, 2019 and 2020, the Company recorded approximately $1.1 million, $0.5 million and $0.3 million, respectively, for write-down of inventory under cost of goods sold.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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