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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |
Deductible grants | $ 75 | $ 77 | $ 2,204

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- Definition Grants and reimbursements received or receivable from governmental institutions and collaboration partners for research and development expenses incurred. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration