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v3.20.2

CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Operating activities |  |
Net loss | $ (65,437) | $ (75,150)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation expense | 1,399 | 1,993
Amortization of deferred financing costs | 416 | 550
Amortization of deferred compensation for services | 235 | 231
Amortization of premium on investment securities | (241) | (666)
Non-cash lease expense | 1,568 | 1,356
Stock-based compensation | 8,149 | 7,724
Change in derivative liabilities | 290 | 246
Non-cash interest associated with debt discount accretion | 393 | 353
Changes in operating assets and liabilities: |  |
Unbilled revenue |  | 5,000
Prepaid expenses and other assets | (3,748) | (3,068)
Accounts payable | 303 | 541
Accrued compensation and benefits | (731) | 81
Lease liabilities | (1,914) | (1,301)
Accrued and other liabilities | (871) | (3,237)
Deferred revenue | (3,656) |
Net cash used in operating activities | (63,845) | (65,347)
Investing activities |  |
Proceeds from maturities of investments | 79,402 | 115,484
Purchases of investments | (107,200) | (36,325)
Purchases of property and equipment | (74) | (325)
Net cash (used in) provided by investing activities | (27,872) | 78,834
Financing activities |  |
Proceeds from issuance of common stock under equity incentive and stock purchase plans | 1,593 | 418
Net cash provided by financing activities | 1,593 | 418
Net (decrease) increase in cash and cash equivalents | (90,124) | 13,905
Cash and cash equivalents at beginning of period | 181,133 | 78,768
Cash and cash equivalents at end of period | 91,009 | 92,673
Supplementary disclosure of cash flow information: |  |
Income taxes paid | $ 1 | 2
Supplementary disclosure of non-cash activities: |  |
Right-of-use assets obtained in exchange for lease obligations |  | $ 5,810

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