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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities |  |
Net income (loss) | $ 486 | $ (612)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |
Depreciation of property and equipment | 351 | 332
Stock-based compensation | 3,944 | 3,282
Amortization of discounts and premiums on marketable securities | (287) | (906)
Intangible asset amortization | 370 | 380
Deferred income taxes | 879 | 0
Other non-cash adjustments, net | 314 | 317
Changes in operating assets and liabilities: |  |
Accounts receivable | (2,905) | 2,434
Prepaid expenses and other assets | (3,524) | 247
Inventory | 76 | (44)
Accounts payable and other liabilities | (1,795) | 3,507
Product revenue allowances | 1,184 | 706
Net cash provided by (used in) operating activities | (907) | 9,643
Cash flows from investing activities |  |
Purchases of property and equipment | (373) | (393)
Purchases of marketable securities | (41,400) | (100,803)
Maturities of marketable securities | 62,073 | 64,745
Net cash provided by (used in) investing activities | 20,300 | (36,451)
Cash flows from financing activities |  |
Proceeds from the exercise of stock options | 479 | 179
Net cash provided by financing activities | 479 | 179
Effect of exchange rate changes on cash, cash equivalents and restricted cash | 5 | 2
Net change in cash, cash equivalents and restricted cash | 19,877 | (26,627)
Cash, cash equivalents and restricted cash |  |
Beginning of period | 45,650 | 61,749
End of period | $ 65,527 | $ 35,122

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