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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ (775) $ (1,274)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 2,808 2,819
Amortization of marketable securities premium 113 245
Stock-based compensation 740 589
Provision for doubtful accounts 211 9
Realized gain on sale of investments (859) 0
Loss (gain) on disposal of property, plant and equipment 9 (10)
Loss (gain) on equity investments, net (610) (1,112)
Changes in assets and liabilities:    
Accounts receivable, net (1,630) (4,396)
Inventories (262) 3,783
Prepaid expenses and other current assets 1,954 3,300
Other assets 258 386
Accounts payable 166 (1,500)
Accrued liabilities [1] (1,602) 148
Other long-term liabilities (269) (407)
Net cash provided by operating activities 252 2,580
Cash flows from investing activities:    
Purchases of property, plant and equipment (2,174) (600)
Proceeds from sales of property, plant and equipment 2 10
Purchases of available for sale securities (8,664) (3,728)
Proceeds from sales and maturities of available-for-sale securities 11,752 2,922
Investments in non-marketable equity investments (162) 0
Return of equity method investments 286 327
Net cash provided by (used in) investing activities 1,040 (1,069)
Cash flows from financing activities:    
Proceeds from common stock options exercised 76 6
Repurchases of the Company's common stock, including commission (1,521) 0
Dividends paid by consolidated joint ventures (80) (83)
Net cash used in financing activities (1,525) (77)
Effect of exchange rate changes on cash and cash equivalents 59 (88)
Net increase (decrease) in cash and cash equivalents (174) 1,346
Cash and cash equivalents at the beginning of the period 28,814 24,961
Cash and cash equivalents at the end of the period $ 28,640 $ 26,307
[1] Dividend accrued but not paid by joint ventures of $566 and $647 was included in accrued liabilities as of June 30, 2015 and June 30, 2014, respectively.