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v3.21.2

CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Operating activities |  |
Net loss | $ (78,344) | $ (47,329)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation expense | 787 | 960
Amortization of deferred financing costs | 316 | 282
Amortization of deferred compensation for services | 145 | 158
Amortization of (discount) premium on investment securities | 274 | (227)
Non-cash lease expense | 1,318 | 1,025
Stock-based compensation | 6,306 | 5,622
Change in derivative liabilities | (713) | 152
Non-cash interest associated with debt discount accretion | 141 | 257
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (7,379) | (2,144)
Accounts payable | (3,039) | 2,025
Accrued compensation and benefits | 267 | (1,372)
Operating lease liabilities | (1,361) | (1,251)
Accrued and other liabilities | 2,607 | 174
Deferred revenue | 182 | (2,300)
Net cash used in operating activities | (78,493) | (43,968)
Investing activities |  |
Proceeds from maturities and redemptions of investments | 60,550 | 25,519
Purchases of investments | (48,314) | (62,960)
Purchases of property and equipment | (1,517) | (25)
Net cash provided by (used in) investing activities | 10,719 | (37,466)
Financing activities |  |
Proceeds from issuance of common stock in at-the-market offering, net of issuance costs | 62,446 | 0
Proceeds from issuance of common stock under equity incentive and stock purchase plans | 1,041 | 795
Net cash provided by financing activities | 63,487 | 795
Net decrease in cash and cash equivalents | (4,287) | (80,639)
Cash and cash equivalents at beginning of period | 91,032 | 181,133
Cash and cash equivalents at end of period | 86,745 | 100,494
Supplementary disclosure of cash flow information: |  |
Cash paid for interest | 1,936 | 2,146
Cash paid for income taxes | 3 | 0
Supplementary disclosure of non-cash activities: |  |
Right-of-use assets obtained in exchange for lease obligations | 14,379 | 0
Issuance of common stock for services | $ 0 | $ 311

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