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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net loss $ (1,274) $ (3,560)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 2,819 2,662
Amortization of marketable securities premium 245 269
Stock-based compensation 589 670
Provision for doubtful accounts 9 304
Gain on sale of cost method investment 0 (811)
Gain on disposal of property, plant and equipment (10) (7)
Changes in assets and liabilities:    
Accounts receivable, net (4,396) (2,426)
Inventories 3,783 3,617
Prepaid expenses and other current assets 3,300 (1,359) [1]
Other assets (399) 380
Accounts payable (1,500) (546)
Accrued liabilities 148 [2] 724 [2]
Other long-term liabilities (407) (324)
Net cash provided by (used in) operating activities 2,907 (407)
Cash flows from investing activities:    
Purchases of property, plant and equipment (600) (2,459)
Proceeds from sales of property, plant and equipment 10 9
Purchases of available-for-sale securities (3,728) (13,372)
Proceeds from maturities of available-for-sale securities 2,922 9,048
Net cash used in investing activities (1,396) (6,774)
Cash flows from financing activities:    
Proceeds from common stock options exercised 6 272
Repurchases of the Company's common stock 0 (285)
Dividends paid by joint ventures (83) (1,730)
Net cash used in financing activities (77) (1,743)
Effect of exchange rate changes on cash and cash equivalents (88) 249
Net increase (decrease) in cash and cash equivalents 1,346 (8,675)
Cash and cash equivalents at the beginning of the period 24,961 30,634
Cash and cash equivalents at the end of the period $ 26,307 $ 21,959
[1] Proceeds receivable from sale of cost method investment of $901 was included in prepaid expenses and other current assets as of June 30, 2013.
[2] Dividend accrued but not paid by joint ventures of $647 and $1,168 was included in accrued liabilities as of June 30, 2014 and June 30, 2013, respectively.