Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net loss	$ (14,228)	$ (17,226)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	666	678
Amortization of financing right-of-use asset	65	65
Stock-based compensation expense	2,930	2,459
Change in fair value of warrant liability	(7,670)
Net amortization of premiums and discounts on marketable securities		(49)
Amortization of debt-discount and accretion of deferred debt costs	167	40
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	329	358
Accounts receivable	7	20,000
Contract assets	(298)	(1,477)
Other long-term assets	(27)	(286)
Accounts payable	63	(1,060)
Accrued expenses	(1,680)	(3,357)
Deferred revenue	(2,134)	(902)
Proceeds for tenant improvement incentive from landlord		586
Operating lease asset and liabilities	(180)	417
Net cash (used in) provided by operating activities	(21,990)	246
Investing activities
Purchases of property and equipment	(262)	(1,797)
Maturities of marketable securities		45,000
Net cash (used in) provided by investing activities	(262)	43,203
Financing activities
Payments on financing and capital lease obligations	(64)	(58)
Proceeds from issuance of common stock through employee benefit plans	157	100
Proceeds from issuance of common stock through at-the-market sales agreement, net of issuance costs		11,937
Proceeds from term loan, net of issuance costs		19,714
Proceeds from issuance of common stock in public offering, net of issuance costs	70,353
Payment of issuance cost related to out of period offering and debt issuance	(36)
Net cash provided by financing activities	70,410	31,693
Increase in cash, cash equivalents and restricted cash	48,158	75,142
Cash and cash equivalents, Beginning of period	177,070	44,817
Cash and cash equivalents, End of period	225,228	119,959
Supplemental disclosure of cash flow information:
Cash paid for interest	789	231
Cash paid for tax		7
Non-cash investing and financing activities:
Property and equipment received but unpaid as of period end		991
Deferred debt financing costs incurred but unpaid as of period end		10
Offering costs incurred but unpaid as of period end	$ 26	$ 41