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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (8,192) | $ (9,504)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 307 | 211
Amortization of right-of-use assets | 470 | 437
Amortization of intangible assets | 36 | 26
Provision for bad debt | 22 | 16
Provision for inventory write-down | 924 | 444
Changes in investment gains and losses | (49) | (294)
Share-based compensation | 556 | 2,315
Change in operating assets and liabilities: |  |
Accounts receivable | 3,902 | 112
Inventory | (1,626) | (1,582)
Prepaid expenses and other | (2,024) | (1,783)
Accounts payable and accrued expenses | (1,903) | 1,161
Operating lease obligations | (472) | (423)
Cash paid for interest portion of finance leases |  | (1)
Contract and other liabilities | (3) | (2)
Net cash used in operating activities | (8,052) | (8,867)
Cash flows from investing activities: |  |
Purchase of property and equipment | (5,021) | (478)
Purchase of investments | (11,760) | (48,914)
Proceeds from sale of investments | 25,450 | 57,171
Cash payments for intangible assets | (119) | (9)
Net cash provided by investing activities | 8,550 | 7,770
Cash flows from financing activities: |  |
Payments for repurchase of common stock for employee tax withholding | (639) |
Cash paid for debt portion of finance leases | (5) | (7)
Proceeds from exercise of stock options | 316 | 332
Net cash provided by /( used for) financing activities | (328) | 325
Net increase / (decrease) in cash, cash equivalents, and restricted cash | 170 | (772)
Cash, cash equivalents, and restricted cash, beginning of period | 41,724 | 30,294
Cash, cash equivalents and restricted cash, end of period | 41,894 | 29,522
Supplemental disclosures of cash flow activity: |  |
Cash paid for interest | 11 | 14
Supplemental disclosure of non-cash investing and financing activities: |  |
Acquisition of fixed assets in accounts payable and accrued expenses | 3,674 | 946
Right-of-use asset and operating lease liability (Adoption of ASC 842) | $ 120 | $ 618

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