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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities:      
Net income (loss) $ (2,210) $ 3,010 $ 348
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation of property, plant and equipment 2,290 2,109 1,929
Allowance for doubtful accounts receivable       (101)
Amortization of land use right 36 36 33
Amortization of acquired intangible assets 3,056 1,803 1,901
Utilization of subsidy from local authorities of Zhuhai, the People's Republic of China (the "PRC") (674) (995) (225)
Write down of inventories 180 232 378
Loss on disposal of property, plant and equipment 5 28 42
Loss on disposal of intangible assets    4   
Impairment loss recognized in respect of goodwill    468   
Impairment loss recognized in respect of intangible assets    420   
Remeasurement gain on equity interest on acquisition of a subsidiary       (494)
Fair value change in trading securities (2) (4) 2
Investment income from other investment    (268)   
Gain on disposal of other investments    (195) (137)
Share-based compensation 1,465 1,928 1,532
Deferred tax 454 428 419
Proceeds from disposal of trading securities 459    5
Share of net loss (income) of equity method investees (41) 1,113 781
Impairment recognised in respect of other investments 2,543      
Changes in operating assets and liabilities:      
Accounts receivable 3,150 947 (150)
Amounts due from a related party (331) 550 (39)
Inventories (4,510) (2,632) 222
Prepaid expenses and other current assets (2,549) 1,736 (1,326)
Amount due from an equity method investee (14) 47 410
Accounts payable 3,598 1,310 (32)
Accrued expenses and other current liabilities (3,526) (3,002) (1,680)
Income tax recoverable (189)      
Income tax payable (190) 94 14
Deposit paid for acquisition of land use right       (901)
Rental deposit (paid) received 4 (8) (1)
Net cash provided by (used in) operating activities (3,296) 7,265 3,230
Investing activities:      
Purchase of marketable securities (132,376) (272,240) (100,498)
Disposal of a subsidiary, net of cash equivalent disposed       (10,110)
Purchase of property, plant and equipment (249) (7,472) (8,851)
Investment in equity method investees (1,500) (9,676) (5,606)
Deposit paid for acquisition of intangible assets       (2,408)
Purchase of intangible assets (1,081) (2,642) (1,762)
Acquisition of a subsidiary, net of cash and cash equivalent acquired       (937)
Investment income from an other investment    268   
Purchase of an other investment    (13,727)   
Proceeds from disposal of property, plant and equipment 22 34 21
Purchase of trading securities       (470)
Decrease (incresase) in time deposit (10,000) 34 28
Proceeds from the disposal of other investments    195 1,251
Proceeds from redemption of marketable securities 178,975 278,568 77,657
Net cash (used in) provided by investing activities 33,791 (26,658) (51,685)
Financing activities:      
Receipt of amount due from a former subsidiary       11,020
Proceeds from exercise of stock options 2,289 671 316
Advance subsidy from local authorities of Zhuhai, the PRC 299 711 302
Raise of short-term bank loans 8,500 12,000   
Repurchase of ordinary shares (4,152) (6,251) (9,019)
Net cash provided by financing activities 6,936 7,131 2,619
Net (decrease) increase in cash and cash equivalents 37,431 (12,262) (45,836)
Cash and cash equivalents at the beginning of the year 33,207 42,872 87,706
Effect of exchange rate changes on cash 698 2,597 1,002
Cash and cash equivalents at the end of the year 71,336 33,207 42,872
Cash paid during the period for:      
Interest (250) (144)   
Income taxes (180) (207) (180)
Non-cash investing activities      
Purchases of intangible assets (2,786) (2,353) (536)
Purchases of property, plant and equipment (898) (1,702) (2,305)
Transfer of an investment in equity method investee to other investment    $ 804