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v3.21.1

Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash flows from operating activities |  |
Net loss | $ (2,487) | $ (8,074)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |
Depreciation and amortization | 1,638 | 1,373
Amortization of premium (accretion of discount) on marketable securities | 865 | (573)
Stock-based compensation | 8,293 | 6,512
Abandonment of capitalized intangible assets | 193 | 28
Equity received in connection with license agreement |  | (4,589)
Change in fair value of equity security | (12,980) | 2,336
Changes in operating assets and liabilities: |  |
Accounts receivable | (1,082) | 14,749
Interest receivable | 311 | 215
Contract asset and deposits | (62) |
Prepaid expenses and other current assets | (3,438) | 71
Accounts payable | (1,291) | 124
Accrued expenses | (5,090) | (1,703)
Lease liabilities and right-of-use (ROU) assets | (42) | (54)
Deferred revenue | (14,794) | (955)
Net cash (used in) provided by operating activities | (29,966) | 9,460
Cash flows from investing activities |  |
Purchase of marketable securities | (84,139) | (142,477)
Purchase of intangible assets | (72) | (538)
Purchase of property and equipment | (1,951) | (2,073)
Proceeds from maturities and sale of marketable securities | 124,210 | 157,653
Net cash provided by investing activities | 38,048 | 12,565
Cash flows from financing activities |  |
Proceeds from issuance of common stock upon exercise of stock awards | 5,339 | 1,471
Net cash provided by financing activities | 5,339 | 1,471
Net increase in cash and cash equivalents | 13,421 | 23,496
Cash and cash equivalents, beginning of year | 163,544 | 50,312
Cash and cash equivalents, end of year | 176,965 | 73,808
Cash paid during the period for: |  |
Interest | 4 | 6
Supplemental disclosures of non-cash investing activities |  |
Net unrealized gain (loss) on marketable securities available-for-sale | $ 23 | $ (105)

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