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v3.20.4

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |
Net loss | $ (56,241) | $ (55,178)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 3,627 | 3,204
Depreciation and amortization | 138 | 146
Changes in operating assets and liabilities: |  |
Accounts receivable | 11,687 | (15,000)
Prepaid and other assets | (3,043) | (490)
Accounts payable | 1,652 | 3,031
Accrued compensation and other accrued liabilities | 82 | 5,599
Operating lease liability and right-of-use asset | 67 | 75
Deferred revenue | (13,017) | 15,000
Net cash flows used in operating activities | (55,048) | (43,613)
Investing Activities |  |
Proceeds from maturities of short-term investments | 107,565 | 157,433
Purchase of short-term and long-term investments | (97,635) | (129,977)
Purchases of property and equipment | (267) | (64)
Net cash flows provided by investing activities | 9,663 | 27,392
Financing Activities |  |
Issuance of common stock for public offering, net of issuance costs | 59,941 |
Issuance of common stock from ESPP purchase and stock option exercises | 435 | 327
Net cash flows provided by financing activities | 60,376 | 327
Net increase (decrease) in cash and cash equivalents | 14,991 | (15,894)
Cash and cash equivalents at beginning of the period | 15,369 | 31,263
Cash and cash equivalents at end of the period | 30,360 | 15,369
Supplemental Disclosure of Non-Cash Investing and Financing Activities: |  |
Right-of-use asset and operating lease liability recorded upon the adoption of ASC 842 |  | $ 2,052
Right-of-use assets obtained in exchange for operating lease liabilities | $ 476 |

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