Quarterly report pursuant to Section 13 or 15(d)

Unaudited Condensed Consolidated Statements of Cash Flows

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (3,623)	$ (12,474)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	133	82
Stock-based compensation expense	1,528	1,220
Amortization of debt issuance costs and discount	937	910
Change in fair value of warrant liabilities	(35,378)	(16,114)
Change in fair value of derivative liabilities	(1,772)	(6,683)
Noncash operating lease expense for right-of-use asset	149	144
Loss on extinguishment of debt	2,725	806
Noncash consideration associated with common stock purchase agreement	0	602
Changes in operating assets and liabilities:
Prepaid expenses, other assets, deferred costs, and other	1,271	1,482
Accounts payable, accrued expenses, and other	4,990	(2,757)
Net cash used in operating activities	(29,040)	(32,782)
Cash flows from investing activities:
Maturities of investments	0	20,713
Purchases of property and equipment	0	(4)
Purchase of intangible assets	(589)	0
Purchases of investments	0	(14,235)
Net cash (used in) provided by investing activities	(589)	6,474
Cash flows from financing activities:
Proceeds from common stock issued	8,027	4,702
Payments of offering costs and underwriting discounts and commissions	(151)	(279)
Proceeds from loan payable	30,000	0
Payments of loan payable issuance costs	(1,253)	0
Proceeds from common stock issuance under employee stock purchase plan	22	28
Repurchase of shares to satisfy tax withholdings	(3)	(75)
Proceeds from senior convertible notes	0	10,000
Payments of senior convertible notes issuance costs	0	(494)
Net cash provided by financing activities	36,642	13,882
Net increase (decrease) in cash, cash equivalents, and restricted cash	7,013	(12,426)
Cash, cash equivalents, and restricted cash at beginning of period	93,314	42,193
Cash, cash equivalents, and restricted cash at end of period	100,327	29,767
Supplemental cash flow information:
Cash paid for interest	1,569	840
Cash received for interest	18	186
Noncash financing and investing activities:
Common stock issued for settlement of senior convertible notes	7,452	2,784
Purchased intangible assets included in accounts payable and accrued expenses	556	0
Deferred offering and issuance costs included in accounts payable and accrued expenses	50	54
Deferred offering costs reclassified to additional-paid-in capital	30	1
Common stock issued for commitment shares	0	602
Reclass of warrant liability to additional paid in capital	298	0
Reclass of deferred asset associated with issuance of loan payable to debt discount	390	0
Settlement of liability for exercise of warrants	$ 805	$ 0