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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating activities:      
Net income (loss) $ 122 $ (2,210) $ 3,010
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation of property, plant and equipment 2,072 2,290 2,109
Amortization of land use right 36 36 36
Amortization of acquired intangible assets 3,480 3,056 1,803
Utilization of subsidy from local authorities of Zhuhai, the People's Republic of China (the "PRC") (1,068) (674) (995)
Loss on disposal of property, plant and equipment    5 28
Loss on disposal of intangible assets       4
Impairment loss recognized in respect of goodwill       468
Impairment loss recognized in respect of intangible assets       420
Fair value change in trading securities    (2) (4)
Investment income from other investment       (268)
Gain on disposal of other investments       (195)
Share-based compensation 492 1,465 1,928
Deferred tax 274 454 428
Proceeds from disposal of trading securities    459   
Share of net loss (income) of equity method investees 264 (41) 1,113
Dividend income from an other investment (493)      
Impairment recognized in respect of other investments 681 2,543   
Changes in operating assets and liabilities:      
Accounts receivable 195 (3,150) (947)
Amounts due from a related party (961) (331) 550
Inventories (7,821) (4,330) (2,400)
Prepaid expenses and other current assets 922 (2,549) 1,736
Amount due from an equity method investee 41 (14) 47
Accounts payable (2,198) 3,598 1,310
Accrued expenses and other current liabilities (3,717) (3,526) (3,002)
Income tax recoverable 123 (189)   
Income tax payable 2 (190) 94
Rental deposit (paid) received (11) 4 (8)
Net cash provided by (used in) operating activities (7,560) (3,296) 7,265
Investing activities:      
Purchase of marketable securities (113,329) (132,376) (272,240)
Purchase of property, plant and equipment (706) (249) (7,472)
Investment in equity method investees (3,712) (1,500) (9,676)
Deposit paid for acquisition of intangible assets (145)      
Purchase of intangible assets (4,134) (1,081) (2,642)
Investment income from an other investment       268
Purchase of an other investment       (13,727)
Proceeds from disposal of property, plant and equipment 41 22 34
Decrease (incresase) in time deposit (340)    34
Increase in restricted deposits (16,819) (10,000)   
Proceeds from the disposal of other investments       195
Proceeds from redemption of marketable securities 112,966 178,975 278,568
Net cash (used in) provided by investing activities (26,178) 33,791 (26,658)
Financing activities:      
Proceeds from exercise of share-based awards 3,041 2,289 671
Advance subsidy from local authorities of Zhuhai, the PRC 714 299 711
Raise of short-term bank loans 15,000 (8,500) 12,000
Repurchase of ordinary shares (4,853) (4,152) (6,251)
Net cash provided by financing activities 13,902 6,936 7,131
Net (decrease) increase in cash and cash equivalents (19,836) 37,431 (12,262)
Cash and cash equivalents at the beginning of the year 71,336 33,207 42,872
Effect of exchange rate changes on cash 1,763 698 2,597
Cash and cash equivalents at the end of the year 53,263 71,336 33,207
Cash paid during the period for:      
Interest (498) (250) (144)
Income taxes (90) (312) (207)
Non-cash investing activities      
Purchases of intangible assets (1,112) (2,786) (2,353)
Purchases of property, plant and equipment (156) (898) (1,702)
Transfer of an investment in equity method investee to other investment       $ 804