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	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net loss	$ (34,422)	$ (35,916)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,370	1,104
Amortization of financing right-of-use asset	130	77
Loss on disposal of fixed assets		1
Stock-based compensation expense	5,186	4,234
Net amortization of premiums and discounts on marketable securities	(49)	(542)
Amortization of debt-discount and accretion of deferred debt costs	117
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	376	(595)
Accounts receivable	19,998
Contract assets	(1,451)
Other long-term assets	(378)	(8)
Accounts payable	(2,152)	(1,551)
Accrued expenses	(1,653)	(4,614)
Deferred revenue	(1,556)	(916)
Proceeds for tenant improvement incentive from landlord	2,035
Operating lease asset and liabilities	264	300
Net cash used in operating activities	(12,185)	(38,426)
Investing activities
Purchases of property and equipment	(2,785)	(1,911)
Purchases of marketable securities		(33,636)
Maturities of marketable securities	50,000	64,000
Net cash provided by investing activities	47,215	28,453
Financing activities
Payments on financing and capital lease obligations	(118)	(94)
Proceeds from issuance of common stock through employee benefit plans	212	7
Proceeds from the issuance of common stock through employee stock purchase plan	223
Proceeds from issuance of common stock through at-the-market sales agreement, net of issuance costs	11,896
Proceeds from term loan, net of issuance costs	19,700
Proceeds from issuance of common stock and accompanying warrants in public offerings and private placements, net of issuance costs		60,362
Proceeds from issuance of convertible preferred stock and accompanying warrants in public offering, net of issuance costs		4,638
Net cash provided by financing activities	31,913	64,913
Increase in cash, cash equivalents and restricted cash	66,943	54,940
Cash and cash equivalents, Beginning of period	44,817	50,814
Cash and cash equivalents, End of period	111,760	105,754
Supplemental disclosure of cash flow information:
Cash paid for interest	642	31
Cash paid for tax	7	29
Non-cash investing and financing activities:
Property and equipment received but unpaid as of period end	301	1,044
Assets acquired under financing lease		997
Offering costs incurred but unpaid as of period end	$ 176	$ 3