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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities: |  |  |
Net income (loss) |  | $ (1,023) | $ 3,190
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization |  | 1,460 | 1,070
Amortization of marketable securities premium |  | 18 | 43
Impairment charge on equity investee |  | 1,068 |
Stock-based compensation |  | 558 | 467
Loss on disposal of equipment |  | 31 |
Gain from deconsolidation of a subsidiary |  | (175) |
Loss from equity method investments, net |  | 561 | 334
Changes in operating assets and liabilities: |  |  |
Accounts receivable |  | 153 | 1,686
Inventories |  | 6,279 | (4,553)
Prepaid expenses and other current assets |  | 517 | 993
Other assets |  | (766) | (64)
Accounts payable |  | (5,555) | 334
Accrued liabilities | [1] | (5,996) | (2,096)
Other long-term liabilities, including royalties |  | 7 | 191
Net cash provided by (used in) operating activities |  | (2,863) | 1,595
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment |  | (2,909) | (11,849)
Purchases of available-for-sale securities |  |  | (9,938)
Proceeds from sales and maturities of available-for-sale securities |  | 9,800 | 14,680
Net cash provided by (used in) investing activities |  | 6,891 | (7,107)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock and options exercised, net of issuance costs |  |  | 66
Proceeds from sale of previously consolidated subsidiary shares |  | 366 |
Net cash provided by financing activities |  | 366 | 66
Effect of exchange rate changes on cash and cash equivalents |  | 140 | 283
Net (decrease) increase in cash and cash equivalents |  | 4,534 | (5,163)
Cash and cash equivalents at the beginning of the period |  | 16,526 | 44,352
Cash and cash equivalents at the end of the period |  | $ 21,060 | $ 39,189
[1] | * Dividend accrued but not paid by one of our consolidated subsidiaries of $0 and $552 was included in accrued liabilities as of March 31, 2019 and 2018, respectively.

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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Balance Type: | debit
Period Type: | duration