CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES
Net (loss) income	$ (4,280)	$ 570
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation	233	91
Stock compensation expense	4,913	1,577
Amortization of debt discounts and issuance costs	0	224
Other	33	0
Change in operating assets and liabilities:
Accounts receivable	(1,558)	161
Prepaid expenses and other current assets	1,679	(129)
Inventory	(93)	19
Other assets	(225)	(77)
Accounts payable	(40)	56
Accrued compensation	(3,899)	(2,645)
Other accrued liabilities	(330)	(96)
Deferred rent and other liabilities	(64)	(2)
Net cash used in operating activities	(3,631)	(251)
INVESTING ACTIVITIES
Purchases of property and equipment	(750)	(500)
Net cash used in investing activities	(750)	(500)
FINANCING ACTIVITIES
Payment of common stock offering costs	(336)	0
Proceeds from exercise of common stock options	991	71
Proceeds from contributions to the employee stock purchase plan	855	488
Net cash provided by financing activities	1,510	559
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2,871)	(192)
Beginning of period	409,852	98,845
End of period	406,981	98,653
DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued purchases of property and equipment	$ 220	$ 270