Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CASH FLOWS

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net loss	$ (84,038)	$ (75,438)	$ (62,279)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,774	2,521	1,604
Amortization of financing right-of-use asset	261	201
Loss on disposal of fixed assets		(181)
Stock-based compensation expense	10,939	9,839	6,610
Change in fair value of warrant liability	375
Net amortization of premiums and discounts on marketable securities	(49)	(949)	(642)
Amortization of debt-discount and accretion of deferred debt costs	287
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	309	(783)	(500)
Accounts receivable	19,993	(20,158)
Contract assets	(2,166)
Other long-term assets	(1,269)		(34)
Accounts payable	(1,057)	1,493	888
Accrued expenses	593	(3,576)	4,191
Deferred revenue	(6,292)	18,176	10,202
Proceeds for tenant improvement incentive from landlord	2,035	7,237
Operating lease asset and liabilities	(59)	1,365
Deferred rent and lease incentive			(355)
Net cash used in operating activities	(57,364)	(60,253)	(40,315)
Investing activities
Purchases of property and equipment	(3,336)	(12,638)	(1,384)
Proceeds from the disposition of property and equipment		110	9
Purchases of marketable securities		(108,206)	(96,768)
Maturities of marketable securities	50,000	109,000	87,500
Net cash provided by (used in) investing activities	46,664	(11,734)	(10,643)
Financing activities
Payments on financing and capital lease obligations	(241)	(205)	(50)
Proceeds from issuance of common stock through employee benefit plans	1,076	211	626
Proceeds from the issuance of common stock through employee stock purchase plan	433	161
Proceeds from the issuance of common stock through exercise of warrants		2
Proceeds from issuance of common stock through at-the-market sales agreement, net of issuance costs	11,896	824	16,538
Proceeds from term loan, net of issuance costs	39,619
Proceeds from issuance of common stock and accompanying warrants and pre-funded warrants in private placement, net of issuance costs	90,377
Proceeds from issuance of common stock and accompanying warrants in public offerings and private placements, net of issuance costs		60,359	51,970
Proceeds from issuance of convertible preferred stock and accompanying warrants in public offering, net of issuance costs		4,638
Payment of offering costs	(207)
Net cash provided by financing activities	142,953	65,990	69,084
Increase (decrease) in cash, cash equivalents and restricted cash	132,253	(5,997)	18,126
Cash and cash equivalents, Beginning of period	44,817	50,814	32,688
Cash and cash equivalents, End of period	177,070	44,817	50,814
Supplemental disclosure of cash flow information:
Cash paid for interest	1,505	72	2
Cash paid for tax	7	29	7
Non-cash investing and financing activities:
Property and equipment received but unpaid as of period end	6	1,565	268
Asset acquired under operating lease		16,240
Assets acquired under financing lease		1,059	$ 28
Deferred debt financing costs incurred but unpaid as of period end	5	58
Offering costs incurred but unpaid as of period end	$ 298	$ 23