STATEMENTS OF CASH FLOWS DATA - Supplemental Investing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental operating and investing activities:
Net unrealized (loss) gain on marketable securities	$ (251)	$ (54)	$ 315
Operating lease assets obtained in exchange for operating lease liabilities		3,575	$ 2,473
Interest paid	$ 2,704	$ 388