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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income (loss) | $ (20,044) | $ 54,343 | $ (45,291)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities: |  |  |
Depreciation and amortization | 2,197 | 855 | 968
Stock-based compensation | 5,464 | 8,686 | 6,102
Impairment of right-of-use lease asset | 939 |  |
Foreign currency translation loss | 102 | 0 | 0
Deferred income taxes | 431 | 109 | (32)
Other | (3) | 26 | 1
Changes in operating assets and liabilities: |  |  |
Accounts and other receivables | (2,334) | (245) | 576
Prepaid expenses and other current assets | (4,374) | (4,015) | 141
Other assets | (11,379) | (7,188) | (197)
Accounts payable | (2,815) | (3,035) | 696
Accrued compensation | (1,104) | (185) | (620)
Other current liabilities | (728) | (702) | (491)
Deferred revenue | (4,150) | 21,406 | (5,575)
Other long-term liabilities | 3,699 | (131) | (107)
Net cash (used in) provided by operating activities | (34,099) | 69,924 | (43,829)
Cash flows provided by (used in) investing activities: |  |  |
Purchases of short-term investments | (8,930) | (17,693) | (23,807)
Proceeds from maturities of short-term investments | 20,000 | 26,004 | 35,000
Purchases of property and equipment | (150) | (74) | (125)
Net cash provided by investing activities | 10,920 | 8,237 | 11,068
Cash flows provided by (used in) financing activities: |  |  |
Proceeds from issuance of common stock under employee stock purchase plan | 165 | 218 | 328
Proceeds from stock options exercise | 1,245 | 7,987 | 518
Cash paid for purchases of treasury stock | (2,741) | 0 | (328)
Net cash (used in) provided by financing activities | (1,331) | 8,205 | 518
Net (decrease) increase in cash and cash equivalents | (24,510) | 86,366 | (32,243)
Cash and cash equivalents: |  |  |
Beginning of year | 110,988 | 24,622 | 56,865
End of year | 86,478 | 110,988 | 24,622
Supplemental disclosure of cash flow information: |  |  |
Cash paid for taxes | 160 | 151 | 191
Supplemental disclosure of non-cash operating, investing, and financing activities: |  |  |
Cashless option exercise under company stock plan | 0 | 1,478 | 0
Release of Restricted Stock Units and Awards under company stock plan | $ 7,190 | $ 2,806 | $ 2,661

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