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STATEMENTS OF CASH FLOWS DATA - Supplemental Investing Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental operating and investing activities: |  |  |
Net unrealized (loss) gain on marketable securities | $ (54) | $ 315 | $ 24
Operating lease assets obtained in exchange for operating lease liabilities | 3,575 | $ 2,473 |
Interest paid | $ 388 |  |

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