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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.