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STATEMENTS OF CASH FLOWS DATA - Supplemental Investing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- Definition

Amount of cash paid for interest capitalized, classified as investing activity.

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Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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