Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net Loss	$ (27,463,000)	$ (22,784,000)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	518,000	632,000
Stock-based compensation	5,320,000	5,290,000
Amortization of operating lease right-of-use asset	169,000	2,252,000
Gain on right-of-use asset termination	(258,000)
Loss (gain) on disposal of fixed assets	4,000	(19,000)
Amortization of premium/discount on purchased securities	0	(5,000)
Amortization of debt issuance costs	12,000	0
Accretion of final payment on term loan	43,000	0
Changes in operating assets and liabilities:
Account receivable	2,407,000	(487,000)
Prepaid expenses and other current assets	(1,268,000)	(2,787,000)
Other assets	0	250,000
Deposits	(1,075,000)	(47,000)
Accounts payable	(1,023,000)	922,000
Accrued expenses	(1,062,000)	(784,000)
Research and development contract liability	(645,000)	(1,726,000)
Operating lease liability	(100,000)	(2,272,000)
Net cash used in operating activities	(24,421,000)	(21,565,000)
Cash flows from investing activities
Purchases of property and equipment	(92,000)	(900,000)
Cash received from the sale of fixed asset	3,000	19,000
Redemption of short-term investments	0	10,000,000
Net cash used in (provided by) investing activities	(89,000)	9,119,000
Cash flows from financing activities
Proceeds from ATM offering, net of sales agent commission and fees	16,598,000	10,357,000
Proceeds from borrowings under term loan	10,000,000	0
Proceeds from exercise of stock options	0	1,228,000
Payment of debt issuance cost	(142,000)	0
Restricted stock awards withheld at vesting to cover taxes	(191,000)	(85,000)
Net cash provided by financing activities	26,265,000	11,500,000
Net (decrease)/increase in cash, cash equivalents, and restricted cash	1,755,000	(946,000)
Cash, cash equivalents, and restricted cash at beginning of period	64,521,000	75,016,000
Cash, cash equivalents, and restricted cash at end of period	66,276,000	74,070,000
Supplemental disclosures of non-cash investing and financing activities:
Income Taxes Paid	0	206,000
Cash paid for interest	214,000	0
Right-of-use asset and lease liability (new lease)	9,057,000	0
Operating lease modification	$ 7,119,000	$ 0