Montage Technology Inactive 10-Q/A11 Dec 132013 Q3 Quarterly report (amended)Financial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2013	Nov. 08, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q/A	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'MONTAGE TECHNOLOGY GROUP LTD	'
Entity Central Index Key	'0001375514	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	26,476,143

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$41,181	$21,580
Short-term investments	6,443	6,472
Accounts receivable, net	10,413	7,903
Inventories	9,830	11,116
Prepaid expenses and other current assets	2,591	2,000
Current deferred tax assets	343	338
Total current assets	70,801	49,409
Property and equipment, net	2,459	2,284
Acquired intangible assets, net	1,020	1,496
Deferred tax assets	330	330
Deferred offering costs	3,240	283
Total assets	77,850	53,802
Current liabilities:	'	'
Accounts payable	5,345	3,719
Short-term loans	'	1,591
Accrued liabilities	11,941	9,108
Deferred margin, net	1,545	1,200
Income tax payable	1,422	261
Current deferred tax liabilities	34	34
Total current liabilities	20,287	15,913
Long-term liabilities	4,288	4,295
Total liabilities	24,575	20,208
Commitments and contingencies	'	'
Shareholders' equity (deficit):	'	'
Ordinary shares, $0.0125 par value; 26,804,639 shares authorized; 4,403,859 and 4,660,025 issued and outstanding as of December 31, 2012 and September 30, 2013, respectively	58	55
Additional paid-in capital	3,515	1,010
Accumulated comprehensive income	2,148	1,811
Statutory reserves	740	740
Accumulated deficit	-7,586	-24,399
Total shareholders' equity (deficit)	-1,125	-20,783
Total liabilities, convertible preferred shares and shareholders' equity (deficit)	77,850	53,802
Series A Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	6,000	6,000
Series B Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	17,020	17,020
Series B-1 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	21,048	21,048
Series B-2 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	10,332	10,309
Pro Forma [Member]	'	'
Current assets:	'	'
Cash and cash equivalents	41,181	'
Short-term investments	6,443	'
Accounts receivable, net	10,413	'
Inventories	9,830	'
Prepaid expenses and other current assets	2,591	'
Current deferred tax assets	343	'
Total current assets	70,801	'
Property and equipment, net	2,459	'
Acquired intangible assets, net	1,020	'
Deferred tax assets	330	'
Deferred offering costs	3,240	'
Total assets	77,850	'
Current liabilities:	'	'
Accounts payable	5,345	'
Short-term loans	'	'
Accrued liabilities	11,941	'
Deferred margin, net	1,545	'
Income tax payable	1,422	'
Current deferred tax liabilities	34	'
Total current liabilities	20,287	'
Long-term liabilities	4,288	'
Total liabilities	24,575	'
Commitments and contingencies	'	'
Shareholders' equity (deficit):	'	'
Ordinary shares, $0.0125 par value; 26,804,639 shares authorized; 4,403,859 and 4,660,025 issued and outstanding as of December 31, 2012 and September 30, 2013, respectively	260	'
Additional paid-in capital	57,713	'
Accumulated comprehensive income	2,148	'
Statutory reserves	740	'
Accumulated deficit	-7,586	'
Total shareholders' equity (deficit)	53,275	'
Total liabilities, convertible preferred shares and shareholders' equity (deficit)	77,850	'
Pro Forma [Member] \| Series A Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	'	'
Pro Forma [Member] \| Series B Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	'	'
Pro Forma [Member] \| Series B-1 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	'	'
Pro Forma [Member] \| Series B-2 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares:	'	'
Convertible preferred shares, value	'	'

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Ordinary shares, par value	$0.01	$0.01
Ordinary shares, shares authorized	26,804,639	26,804,639
Ordinary shares, shares issued	4,660,025	4,403,859
Ordinary shares, shares outstanding	4,660,025	4,403,859
Series A Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	$0.01
Convertible Preferred Shares, Shares Authorized	4,800,000	4,800,000
Convertible preferred shares, shares issued	4,800,000	4,800,000
Convertible preferred shares, shares outstanding	4,800,000	4,800,000
Convertible preferred shares, liquidation value	$6,000	$6,000
Series B Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	$0.01
Convertible Preferred Shares, Shares Authorized	4,681,416	4,681,416
Convertible preferred shares, shares issued	4,255,843	4,255,843
Convertible preferred shares, shares outstanding	4,255,843	4,255,843
Convertible preferred shares, liquidation value	13,092	13,092
Series B-1 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	$0.01
Convertible Preferred Shares, Shares Authorized	4,551,709	4,551,709
Convertible preferred shares, shares issued	4,049,276	4,049,276
Convertible preferred shares, shares outstanding	4,049,276	4,049,276
Convertible preferred shares, liquidation value	16,191	16,191
Series B-2 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	$0.01
Convertible Preferred Shares, Shares Authorized	3,571,514	3,571,514
Convertible preferred shares, shares issued	2,839,409	2,839,409
Convertible preferred shares, shares outstanding	2,839,409	2,839,409
Convertible preferred shares, liquidation value	$7,947	$7,947
Pro Forma [Member]	'	'
Ordinary shares, par value	$0.01	'
Ordinary shares, shares authorized	26,804,639	'
Pro Forma [Member] \| Series A Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	'
Convertible Preferred Shares, Shares Authorized	4,800,000	'
Convertible preferred shares, shares outstanding	'	'
Pro Forma [Member] \| Series B Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	'
Convertible Preferred Shares, Shares Authorized	4,681,416	'
Convertible preferred shares, shares outstanding	'	'
Pro Forma [Member] \| Series B-1 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	'
Convertible Preferred Shares, Shares Authorized	4,551,709	'
Convertible preferred shares, shares outstanding	'	'
Pro Forma [Member] \| Series B-2 Convertible Preferred Shares [Member]	'	'
Convertible preferred shares, par value	$0.01	'
Convertible Preferred Shares, Shares Authorized	3,571,514	'
Convertible preferred shares, shares outstanding	'	'

Condensed_Consolidated_Stateme

Condensed Consolidated Statement of Operations and Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Revenue	$30,056	$20,601	$75,448	$54,538
Cost of revenues:	-10,907	-7,683	-27,496	-21,374
Gross profit	19,149	12,918	47,952	33,164
Operating expenses:	'	'	'	'
Research and development	-6,623	-3,835	-19,096	-12,304
Sales, general and administrative	-3,880	-2,382	-10,681	-5,614
Total operating expenses	-10,503	-6,217	-29,777	-17,918
Income from operations	8,646	6,701	18,175	15,246
Interest income, net	202	71	504	75
Other income (expense), net	-70	20	-157	253
Income before income tax expenses	8,778	6,792	18,522	15,574
Provision for income tax	-737	-427	-1,709	-980
Net income	8,041	6,365	16,813	14,594
Other comprehensive income	'	'	'	'
Cumulative translation adjustments	130	-36	337	-93
Comprehensive income	8,171	6,329	17,150	14,501
Accretion for Series B-2 convertible preferred shares	'	-14	-23	-42
Allocation to participating preferred shares and restricted shares	-6,460	-5,194	-13,651	-12,038
Net income attributable to ordinary shareholders-Basic	1,581	1,157	3,139	2,514
Undistributed earnings re-allocated to ordinary shareholders	455	397	926	847
Net income attributable to ordinary shareholders-Diluted	$2,036	$1,554	$4,065	$3,361
Net income per share:	'	'	'	'
Basic	$0.34	$0.27	$0.68	$0.58
Diluted	$0.31	$0.24	$0.62	$0.53
Weighted-average shares used in computing net income per share:	'	'	'	'
Basic	4,658,034	4,321,144	4,618,302	4,303,135
Diluted	6,527,371	6,391,252	6,557,368	6,295,066

Condensed_Consolidated_Stateme1

Condensed Consolidated Statement of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income	$16,813	$14,594
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	1,915	644
Share-based compensation	2,462	682
Deferred income taxes	2	61
Inventory write-downs	414	204
Exchange loss (gain)	320	-61
Changes in assets and liabilities:	'	'
Accounts receivable	-2,510	-1,492
Inventories	957	-381
Prepaid expenses and other current assets	-488	7
Accounts payable	1,615	-2,717
Income tax payable	1,154	922
Deferred margin, net	345	-4,139
Other payables and accruals	103	-2,255
Net cash provided by operating activities	23,102	6,069
Cash flows from investing activities:	'	'
Purchases of property and equipment	-1,160	-1,509
Purchase of intangible assets	-484	-950
Purchase of short-term investments	-33,190	-6,398
Proceeds from maturities of short-term investments	33,453	3,154
Net cash used in investing activities	-1,381	-5,703
Cash flows from financing activities:	'	'
Proceeds from exercise of options	64	12
Proceeds from early exercise of options	11	'
Proceeds from short-term loans	'	1,578
Repayment for short-term loans	-1,591	-2,056
Cash paid for initial public offering cost	-421	'
Net cash used in financing activities	-1,937	-466
Effect of exchange rate changes on cash	-183	-44
Net increase (decrease) in cash and cash equivalents	19,601	-144
Cash and cash equivalents at beginning of period	21,580	23,343
Cash and cash equivalents at end of period	41,181	23,199
Supplemental Cash Flow Information	'	'
Income taxes paid	554	'
Interest paid	10	79
Non-cash investing and financing activities	'	'
Accounts payable for acquisition of property and equipment	59	70
Vesting of ordinary shares issued for early exercised options	5	9
Accrued initial public offering cost	$2,676	'

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Organization and Summary of Significant Accounting Policies

1. Organization and Summary of Significant Accounting Policies

a. Organization

Montage Technology Group Limited (the “Company”) was incorporated as an international business company with limited liability under International Business Companies Act, 1984 of the British Virgin Islands on March 29, 2004 and continued to, and registered in the Cayman Islands as an exempted company on April 24, 2006. The Company conducts business in several territories including China, Hong Kong, Taiwan and the United States through its wholly owned subsidiaries.

The Company is a global fabless provider of analog and mixed signal semiconductor solutions currently addressing the home entertainment and cloud computing markets. The foundation of its technology platform is the Company’s ability to design high performance, low power semiconductors by using its proprietary building blocks which include radio frequency and analog front end solutions, digital signal processors and high speed interfaces. In the home entertainment market, the Company’s technology platform enables it to design highly integrated solutions with customized software for set-top boxes. The Company’s solutions optimize signal processing performance under demanding operating conditions typically found in emerging market environments. In the cloud computing market, the Company offers high performance, low power memory interface solutions that enable memory intensive server applications.

b. Initial Public Offering

On October 1, 2013, the Company completed an initial public offering (the “Offering”) of 8,165,000 shares of ordinary shares at a price of $10.00 per share, including 5,325,000 additional ordinary shares issued by the Company and 2,840,000 shares sold by existing shareholders. Accordingly, the Company received net proceeds of $49.5 million from the issuance of the ordinary shares in the offering after deducting underwriting discounts and commissions of $3.7 million and excluding other offering expenses of approximately $3.2 million.

Upon completion of the initial public offering on October 1, 2013, the Series A, B, B1 and B2 Convertible Preferred Shares automatically converted into 16,163,598 ordinary shares and the related carrying amount were reclassified as additional paid-in capital. As these transactions occurred after September 30, 2013, they are not reflected in the unaudited condensed consolidated financial statements as of and for the three month period ended September 30, 2013. See Note 19 for discussion of the unaudited pro forma information.

c. Basis of Presentation

The unaudited condensed consolidated financial statements include the accounts of the Company and all of its subsidiaries. All intercompany transactions have been eliminated upon consolidation. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Securities and Exchange Commission (“SEC”), Form 10-Q and Article 10 of SEC Regulation S-X.

The unaudited condensed consolidated financial statements contain all normal recurring accruals and adjustments that, in the opinion of management, are necessary to state fairly the Company’s unaudited consolidated financial position at September 30, 2013 and 2012. The results of operations for the nine months ended September 30, 2013 are not necessarily indicative of the results to be expected for future quarters or the full year.

These unaudited interim condensed financial statements do not include all of the information and footnotes required by US GAAP for complete financial statements. Therefore, these unaudited interim condensed financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related footnotes for the year ended December 31, 2012, included in the Company’s prospectus filed with the SEC in September 2013 (“Company Prospectus”).

All share-related disclosures, including par value, share price, number of ordinary shares, preferred shares, share options, restricted shares, warrants, exercise prices of share options, restricted shares, related fair value per share, and net income per share calculations, have been recast to reflect the 2.5-for-1 reverse share split (See Note 17) for all periods presented.

d. Use of Estimates

The preparation of the interim condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of net revenue and expenses during the reporting period. Actual results could differ from those estimates. Significant accounting estimates reflected in the Company’s consolidated financial statements mainly include share-based compensation, allowance for doubtful accounts, inventory write-down, allowance for deferred tax assets, provision for uncertain tax positions, and estimated useful lives of equipment and intangible assets.

e. Significant Accounting Policies

There has been no material change to the Company’s significant accounting policies disclosed in the Company’s consolidated financial statements for the year ended December 31, 2012 included in the Company Prospectus filed with the SEC in September 2013.

f. Recent Accounting Pronouncements

There has been no material change to Recent Accounting Pronouncements from those disclosed in the Company’s consolidated financial statements for the year ended December 31, 2012 included in the Prospectus filed with the SEC in September 2013.

g. Concentration of Credit Risks

Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable.

As of September 30, 2013, substantially all of the Company’s cash and cash equivalents and short-term investments were held by reputable financial institutions in the jurisdictions where the Company and its subsidiaries are located. The Company believes that it is not exposed to unusual risks as these financial institutions have high credit quality. The Company has not experienced any losses on its deposits of cash and cash equivalents, and short-term investments.

The following table summarizes the percentage of the Company’s revenue and accounts receivable represented by distributors and customers with balances over 10% of total revenue:

For the Three Months Ended

For the Nine Months Ended

September 30,

Revenue

2012

2013

2012

2013

Company A

Company B

Accounts receivable

December 31, 2012

September 30, 2013

Company A

The Company establishes credit limits for each distributor and customer and reviews such limits prior to product shipment. The Company did not experience significant credit loss from its distributors and customers during the periods presented.

Net_Income_Per_Share

Net Income Per Share	9 Months Ended
Net Income Per Share	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Net Income Per Share	'
	2. Net Income Per Share
	The following shows the computation of basic and diluted net income per ordinary share:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Numerator
	Net income	$	8,041		$	6,365		$	16,813		$	14,594
	Less: Accretion for preferred shares		—			(14	)		(23	)		(42	)
	Less: Allocation of net income to participating preferred shares and restricted shares		(6,460	)		(5,194	)		(13,651	)		(12,038	)

	Numerator for basic calculation		1,581			1,157			3,139			2,514
	Undistributed earnings re-allocated to ordinary share holders		455			397			926			847

	Numerator for diluted calculation	$	2,036		$	1,554		$	4,065		$	3,361

	Denominator
	Denominator for basic calculation, weighted-average number of shares of ordinary share outstanding		4,658,034			4,321,144			4,618,302			4,303,135
	Dilutive effect of share option		1,860,216			2,070,108			1,926,644			1,991,931
	Dilutive effect of restricted shares and awards		9,121			—			12,422			—

	Denominator for diluted calculation		6,527,371			6,391,252			6,557,368			6,295,066

	Net income per share
	Basic	$	0.34		$	0.27		$	0.68		$	0.58

	Diluted	$	0.31		$	0.24		$	0.62		$	0.53

	The Company’s preferred shares were participating securities and as such were included in the calculation of basic net income per share under the two-class method pursuant to ASC 260-10-45-60A and 60-B for all periods presented. In addition, the Company granted 317,120 restricted shares in April 2013 with non-forfeitable dividend rights and the holders of these restricted shares are entitled to cash dividends with respect to the restricted shares subject to the award even though such shares are not vested (Note 12). Therefore, pursuant to ASC 260-10-45-61A, these restricted shares are participating securities and related unvested restricted shares are included in the computation of basic net income per share under the two-class method.
	For the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012, under the two-class method for the calculation of net income per share, the noncumulative dividends of 8% of the original issuance price for each series of preferred share were $865, $865, $2,594 and $2,594, respectively, whereas the remaining undistributed earnings attributable to preferred shares on as-if converted basis and restricted shares were $5,595, $4,329, $11,057 and $9,444, respectively.
	For the diluted net income per share calculation, the net income allocated to participating preferred shares and unrestricted shares decreased by $455, $397, $926 and $847, respectively for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012, due to the inclusion of incremental shares for share options and restricted shares which have a dilutive impact on the basic net income per share.
	The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share because including them would be anti-dilutive as of the end of each period presented:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Convertible preferred shares		16,163,598			16,163,598			16,163,598			16,163,598

	The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share for the corresponding periods because the number of shares calculated based on the assumed proceeds from exercise of the equity awards and the weighted average fair value of the Company’s ordinary shares is higher than the number of shares assumed to be issued under the awards:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Equity awards outstanding		1,768,960			403,520			1,726,480			417,120

Fair_Market_Value_of_Financial

Fair Market Value of Financial Instruments	9 Months Ended
Fair Market Value of Financial Instruments	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Market Value of Financial Instruments	'
	3. Fair Market Value of Financial Instruments
	The carrying amounts reflected in the balance sheet for cash and cash equivalents, accounts receivable, prepaid and other current assets, accounts payable, accrued expenses and other current liabilities, approximate their fair value due to the short-term nature of these financial instruments.
	The following table sets forth the financial instruments, measured at fair value by level within the fair value hierarchy as of December 31, 2012 and September 30, 2013:


				Fair value measure at reporting date using
	As of December 31, 2012	As of		Quoted Prices		Significant		Significant
		December 31,		in Active Markets		Other		Unobservable
		2012		for Identical Assets		Observable		Inputs
				(Level 1)		Inputs (Level 2)		(Level 3)
	Cash	$	12,175	$	12,175	$	—	$	—
	Time deposit within the maturity term below 3 months		9,405		9,405		—		—
	Short-term investments		6,472		—		6,472		—

	Total	$	28,052	$	21,580	$	6,472	$	—



				Fair value measure at reporting date using
	As of September 30, 2013	As of		Quoted Prices		Significant		Significant
		September 30,		in Active Markets		Other		Unobservable
		2013		for Identical Assets		Observable		Inputs
				(Level 1)		Inputs (Level 2)		(Level 3)
	Cash	$	27,414	$	27,414	$	—	$	—
	Bank investment product readily convertible within the maturity term below 3 months		9,759		—		9,759		—
	Time deposit with the maturity term below 3 months		4,008		4,008		—		—
	Time deposit with the maturity term greater than 3 months but less than 1 year		50		50		—		—
	Short-term investments		6,393		—		6,393		—

	Total	$	47,624	$	31,472	$	16,152	$	—

	As of September 30, 2013 and December 31, 2012, the investments measured at fair value by level 2 are issued by banks with variable interest rates indexed to performance of underlying assets. Since these investments’ maturity dates are within one year, they are classified as short-term investments. To estimate the fair value of the short-term investments, the Company refers to the quoted rate of return provided by the bank at the end of each period using the discounted cash flow method. The Company classifies the valuation techniques that use these inputs as Level 2 of fair value measurements. The Company recorded in the unaudited condensed consolidated statements of operations and comprehensive income a change in the fair value of short-term investments in the amount of $182, $43, $344, and $63 for the three months and nine months ended September 30, 2013, and 2012, respectively.

Inventories

Inventories	9 Months Ended
Inventories	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	4. Inventories
	Inventories consist of the following:


		As of		As of
		September 30, 2013		December 31, 2012
	Work in progress	$	5,491	$	3,665
	Finished goods		4,339		7,451

		$	9,830	$	11,116

	During the second quarter of 2013, in order to prepare for the implementation of a new ERP system, management performed a detailed review of the production processes of the Company’s products and concluded that, upon completion of the final quality testing and prior to packing for shipping, those products should be included in finished goods as they are ready for sale. Previously, products were not classified as finished goods until they were fully packed for shipment. Accordingly, the Company has revised the classification of work in progress and finished goods by stage of production to include completed but not packaged products as finished goods. Management considers that both approaches of segregating work in progress and finished goods have their basis. To ensure the disclosure of inventory is consistent for each of the periods presented, the Company has revised the classification of inventory by stage of completion by now including $5,464 and $7,373 in finished goods as of December 31, 2012, respectively that was previously included in work in progress. This revision had no impact on total inventory balances.
	For the three months and nine months ended September 30, 2013, and 2012, the Company recorded inventory write-downs of $109, $414, $23, and $204, respectively, due to excess and obsolete inventory and lower of cost or market markdown. As of September 30, 2013 and December 31, 2012, the Company has a total inventory reserve balance of $ 1,321, and $2,406, respectively. Once the write-down is recorded, it establishes a new cost basis and is not subsequently reversed.

Prepaid_Expenses_and_Other_Cur

Prepaid Expenses and Other Current Assets	9 Months Ended
Prepaid Expenses and Other Current Assets	Sep. 30, 2013
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'
Prepaid Expenses and Other Current Assets	'
	5. Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets consist of the following:


		As of		As of
		September 30, 2013		December 31, 2012
	Value-added tax recoverable	$	603	$	486
	Prepaid license fees		141		294
	Prepayment for material purchase		173		170
	Rental deposits		400		321
	Value-added tax refundable on export sales		489		306
	Other prepaid expenses and other current assets		785		423

		$	2,591	$	2,000

Property_and_Equipment_Net

Property and Equipment, Net	9 Months Ended
Property and Equipment, Net	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Property and Equipment, Net	'
	6. Property and Equipment, Net
	Property and equipment, net consist of the following:


		As of			As of
		September 30, 2013			December 31, 2012
	Office and other equipment	$	3,862		$	3,193
	Furniture and fixtures		663			475
	Leasehold improvements		1,665			1,354

			6,190			5,022
	Less: accumulated depreciation and amortization		(3,731	)		(2,738	)

		$	2,459		$	2,284


	The depreciation expense of property and equipment for the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012 was $ 310, $207, $929 and $ 482, respectively.

Acquired_Intangible_Assets_Net

Acquired Intangible Assets, Net	9 Months Ended
Acquired Intangible Assets, Net	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Acquired Intangible Assets, Net	'
	7. Acquired Intangible Assets, Net
	Acquired intangible assets, net consist of the following:


			As of			As of
			September 30, 2013			December 31, 2012
	Assembled workforce (1)		$	1,900		$	1,900
	Technology Licenses			116			150
	Software			265			—
	Montage Macao License (2)			129			—
	Less: accumulated amortization			(1,390	)		(554	)

			$	1,020		$	1,496

	For the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, the Company recorded amortization expense of $324, $124, $986 and $162, respectively.

	-1	Assembled workforce
	On August 23, 2012, Montage Technology Hong Kong Limited, a wholly owned subsidiary of the Company, entered into agreements with a third party to acquire a research and development workforce, intellectual property (“IP”) and computers and office equipment for total cash consideration of $2,016. The acquisition has been completed in September 2012. The Company determined that the acquisition of research and development workforce, IP and computers and office equipment should be accounted for an asset acquisition as the group of assets acquired by the Company did not meet the definition of a business as pursuant to ASC 805. The Company allocated the total consideration to the acquired research and development workforce, IP (which was obsolete) and computers and office equipment with the amount of $1,900, $0 and $116, respectively, on the acquisition date. The research and development workforce is recorded as assembled workforce and amortized on a straight line basis over 18 months as the Company expected the acquired workforce to provide economic benefit to the Company during this period based on the Company’s prior experience in developing research and development workforce and conducting research and development activities.

	-2	Montage Macao license
	The Company entered into a memorandum of understanding to acquire Sonoma Commercial Offshore, Ltd, a Macao Offshore Company, which was subsequently renamed Montage Technology Commercial Offshore Limited (“Montage Macao”), to be the principal entity in the Company’s international corporate structure. The acquisition of Montage Macao was completed in May 2013 when Montage Macao completed its registration with the Macao government and the Company took control over Montage Macao. Montage Macao did not have any assets or liabilities other than a qualification license as a commercial offshore entity in Macao. The Company determined that the acquisition of Montage Macao shall be accounted for as an asset acquisition of its commercial offshore license qualification in Macao as it did not meet the definition of a business as pursuant to ASC 805-20-20 and ASC 805-10-55-4 through 805-10-55-9. The useful life of the commercial offshore license qualification in Macao is indefinite as long as the Company maintains its offshore business in Macao. Therefore, the acquisition cost of $129 for the commercial offshore license is not amortized and shall be tested for impairment annually or more frequently if events or changes in circumstances indicate that the commercial offshore license might be impaired pursuant to ASC 350-30-35-18 through 35-20.

ShortTerm_Loans

Short-Term Loans	9 Months Ended
Short-Term Loans	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Short-Term Loans	'
	8. Short-Term Loans
	There were no short-term bank loans outstanding September 30, 2013. The short-term bank loans outstanding as of December 31, 2012 carried a weighted average interest rate of 5.88%, per annum. The borrowings were repayable in one year of their respective draw-down date. Proceeds from short-term bank borrowings were for working capital purposes. None of the short-term bank loans bear financial covenants or restrictions.
	Short-term bank loans as of December 31, 2012 were all denominated in RMB.

Accrued_Liabilities

Accrued Liabilities	9 Months Ended
Accrued Liabilities	Sep. 30, 2013
Payables And Accruals [Abstract]	'
Accrued Liabilities	'
	9. Accrued Liabilities
	Accrued liabilities consist of the following:


			As of		As of
			September 30, 2013		December 31, 2012
	Government funding for research and development projects (1)		$	3,893	$	3,055
	Accrued employee compensation and other employee expenses			3,504		4,505
	Accrued research and development expenses			—		28
	Advances from customers			267		230
	Accrued warranty			187		149
	Accrued professional service fee			3,484		497
	Proceeds received for early exercised options			8		—
	Other accrued liabilities			598		644

			$	11,941	$	9,108


	-1	For the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, the Company recorded nil, $1,025, $396, and $1,025 government funding as a deduction to expense, respectively. The Company has not recorded any reduction to the carrying value of depreciable assets. As of December 31, 2012 and September 30, 2013, the Company has recorded an accrued liability for cash funding received from the PRC government of $3,055, and $3,893, respectively, because the government had not commenced its review of the research and development projects qualified for funding at the end of the respective periods.

Deferred_Margin_Net

Deferred Margin, Net	9 Months Ended
Deferred Margin, Net	Sep. 30, 2013
Revenue Recognition [Abstract]	'
Deferred Margin, Net	'
	10. Deferred Margin, Net
	Deferred margin, net consists of the following:


			As of			As of
			September 30, 2013			December 31, 2012
	Deferred revenue		$	20,146		$	15,878
	Deferred cost of revenue			(18,601	)		(14,678	)

			$	1,545		$	1,200

	The deferred revenue and deferred cost of revenue on sales to distributor activities for the nine months ended September 30, 2013 and 2012 were as follows:


			Nine Months Ended
			September 30,
			2013			2012
	Balance at the beginning of the period		$	1,200		$	5,147
	Revenue deferred upon shipment to distributors			33,847			27,734
	Cost of sales deferred upon shipments to distributors			(26,952	)		(18,509	)
	Revenue recognized upon resale from distributors to end customers			(29,126	)		(26,295	)
	Cost of sales recognized upon resale from distributors to end customers			23,029			13,126
	Price adjustments to distributors			(453	)		(195	)

	Balance at the end of the period		$	1,545			1,008


	The following table shows reconciliation from revenue recognized upon resale from distributors to end customers as included in the above table to revenue recorded in the consolidated statements of operations and comprehensive income for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012:


			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013		2012
	Revenue recognized upon resale from distributors to end customers (through deferred revenue)		$	12,063		$	7,842		$	29,126	$	26,295
	Revenue recognized upon resale from LQW to end customers (recorded directly in revenue)*			15,136			9,171			38,115		17,998
	Revenue recognized for the Company’s sales directly to end customer			2,857			3,588			8,207		10,245

	Total		$	30,056		$	20,601		$	75,448	$	54,538


	*	LQW has been a distributor for the Company’s products since October 2011. The Company is entitled to bill only a portion of the total sale price at the time of shipment (deferred revenue), with the remainder billed upon sale by LQW to the end customer. The portion of the total sale price that the Company is not entitled to bill at the time of shipment to LQW is recorded directly in revenue upon sale by LQW to the end customers.

Convertible_Preferred_Shares

Convertible Preferred Shares	9 Months Ended
Convertible Preferred Shares	Sep. 30, 2013
Equity [Abstract]	'
Convertible Preferred Shares	'
	11. Convertible Preferred Shares
	Convertible preferred shares consisted of the following as of September 30, 2013:


	Convertible				Par				Subscription				Shares						Carrying		Liquidation
					Value				Price										Amount		Value
					Per
	Preferred Shares		Issuance date		Share				Per Share				Authorized				Outstanding
	Series A		April 23, 2004 and
			August 31, 2004		$	0.0125			$	1.25				4,800,000				4,800,000	$	6,000	$	6,000
	Series B		19-Jun-06			0.0125				3.2263				4,681,416	(1)			3,325,843		13,949		10,730
	Series B issued upon exercise of warrant		December 20, 2007			0.0125				2.54								930,000		3,071		2,362
	Series B-1		18-May-07			0.0125				3.9985				4,551,709				4,049,276		21,048		16,191
	Series B-2		8-Oct-09
			22-Oct-09
			30-Jun-10			0.0125				2.799	(2)			3,571,514				2,839,409		10,332		7,947

														17,604,639				15,944,528	$	54,400	$	43,230



	-1	Authorized shares for Series B convertible preferred shares issued on June 19, 2006 also included shares authorized for Series B convertible preferred shares issued upon exercise of warrant on December 20, 2007.
	-2	Pursuant to the Company’s Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.
	The Company’s Board of Directors is authorized to determine the rights of each offering of convertible preferred shares including, among other terms, dividend rights, voting rights, conversion rights, redemption prices and liquidation preferences, if any, subject to the limitations of applicable laws, regulations and its charter. The following summarizes the terms of each series of convertible preferred shares:
	Conversion Rights
	Each share of Series A, Series B, Series B-1 and Series B-2 is convertible, at the holder’s option, into such number of fully paid and nonassessable ordinary shares as is determined by dividing the applicable original issuance price by the conversion price which is the same as the original issue price.

	In the event of the issuance of additional ordinary shares, subject to certain exclusions, at a price per share less than the conversion price for any series of convertible preferred shares in effect on the date of such issuance, the conversion price for that series will be adjusted based on a weighted average anti-dilution formula. The conversion price is also subject to adjustment based on certain other anti-dilution provisions. Each convertible preferred share will automatically convert into ordinary shares at its then effective conversion rate immediately upon the closing of an initial public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended, covering the offer and sale of ordinary shares with gross proceeds to the Company of not less than $50 million at a price per share of at least $5.00 (“Qualified IPO”). The Company is required to reserve and keep available, out of its authorized but unissued ordinary shares, 16,163,598 shares for the conversion of convertible preferred shares.
	In connection with the issuance of Series B-2 upon the exercise in full of all the Series B-2 warrants, the weighted average price for Series B-2 originally issued in October 2009 and Series B-2 issued upon exercise of warrant in June 2010 was $2.7990 per share, which was less than the original conversion price of Series B issued on June 19, 2006 and Series B-1, the conversion price for Series B issued on June 19, 2006 and Series B-1 was adjusted to $3.1715 and $3.8450 per share, respectively, on August 18, 2010. After such adjustment, each Series B issued on June 19, 2006 and Series B-1 share is convertible into approximately 1.0173 and 1.040 ordinary shares, respectively.
	Dividends
	The holders of each series of convertible preferred shares are entitled to receive noncumulative dividends per annum when and if declared by the Board of Directors. The Series A, Series B, Series B-1 and Series B-2 convertible preferred shares are entitled to dividends at 8% of the original issuance price per share. After the foregoing dividend payments, if any, have been made in full in a given calendar year, any dividends declared by the Board out of funds legally available shall be shared ratably among the holders of ordinary shares; provided, however, that any non-cash dividends shall be shared ratably among the holders of ordinary and preferred shares on an as-if-converted basis. No dividends have been declared or paid to date.
	Liquidation
	In the event of any liquidation, dissolution or winding up of the Company, whether voluntarily or involuntary, including a consolidation, merger or acquisition or sale of assets where the beneficial owners of the Company’s ordinary shares and convertible preferred shares own less than a majority of the resulting voting power of the surviving entity, the holders of Series A, Series B, Series B-1 and Series B-2 convertible preferred shares are entitled to receive an amount equal to 100% of the subscription price per share, based on the number of preferred shares plus any declared but unpaid dividends prior to the distribution to the ordinary shares. The remaining assets, if any, shall be distributed among the holders of ordinary shares on a pro rata basis based on the number of shares they hold.
	Voting Rights
	The holders of each preferred share are entitled to the number of votes equal to the number of ordinary shares into which such preferred shares are converted.
	Redemption Rights
	The holders of the Company’s Series B and B-1 preferred shares hold redemption rights such that at any time after June 19, 2011, if at least two-thirds of the holders of Series B and B-1 convertible preferred shares, voting together, elect to redeem their shares, the Company shall redeem all Series B and B-1 convertible preferred shares. The holders of the Company’s Series B-2 convertible preferred shares hold redemption rights such that at any time after June 1, 2013, if at least two-thirds of the holders of Series B-2 elect to redeem their shares, the Company shall redeem all Series B-2 convertible preferred shares. The redemption price available to Series B, B-1 and B-2 shall be 130% of subscription price per share, plus all declared and unpaid dividends.
	According to the shareholders’ resolution dated August 13, 2013, the first possible redemption dates of the Company’s Series B, B-1 and B-2 preferred shares were amended to January 1, 2014, respectively.

	There was no consideration given to the holders of the Series B, B-1 and B2 preferred shares for the modification of the first possible redemption dates. Based on the assessment the Company performed, the modification for the first possible redemption dates was not involved the transfer of wealth between ordinary shares, Series A and Series B, B-1 and B-2 preferred shares as the modification was viewed as a pre-condition agreed by the holders of ordinary and preferred shares for the Company’s initial public offering.
	The aggregate amount of redemption for all issued redeemable preferred shares each year for the five years following December 31, 2012 is $48,400, respectively.
	Accretion
	In accordance with authoritative guidance and consistent with the accounting for Series B, B-1 and B-2 convertible preferred shares, the carrying value of the Series B, B-1 and B-2 convertible preferred shares is adjusted for accretion to the redemption price over the period from the date of issuance to the first possible redemption date using the effective interest rate method. Before August 13, 2013, when the shareholders approved the modification of the first possible redemption dates of the Company’s Series B, B-1 and B-2 to January 1, 2014, the carrying value of the Series B, B-1 and B-2 convertible preferred shares had already been accreted to the redemption price over the period from the date of issuance to the original fist possible redemption date (June 19, 2011 for Series B and B-1 and June 1, 2013 for Series B-2), respectively. The modification of the first possible redemption date has no impact on the accretion to Series B, B1 and B2’s redemption value.
	For the three months and nine months ended September 30, 2012 and 2013, the accretion to the carrying value of convertible preferred shares was summarized as follows:


			For the Three Months Ended								For the Nine Months Ended
			September 30,								September 30,
			2013				2012				2013				2012
			(unaudited)				(unaudited)				(unaudited)				(unaudited)
	Series B-2			—			$	14			$	23			$	42
	Upon completion of the initial public offering of the Company on October 1, 2013, Series A, B, B1and B2 Preferred Shares automatically converted into 16,163,598 ordinary shares.

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
Share-Based Compensation	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Share-Based Compensation	'
	12. Share-Based Compensation
	The Company’s 2006 Share Incentive Plan (“the 2006 Plan”) was adopted in June 2006. The 2006 Plan provides for the issuance of incentive share options (ISOs), nonstatutory share options (NSOs) and restricted share awards (RSAs). NSOs may be granted to employee, directors and consultants, while ISOs may be granted only to employees and RSAs may be granted to employees, directors or non-employees. Share options granted vest over a maximum period of four years and expire ten years from the date of the grant. Share options generally vest over four years, one-quarter on the first anniversary of the date of the grant and monthly thereafter for the remaining three years. RSAs have various vesting periods determined by the plan administrator, and generally vest over four years, with 25% on each of the anniversary of the vesting commence date. As of September 30, 2013 and December 31, 2012, the number of ordinary shares authorized for equity award issuance under the 2006 Plan was 6,566,544, and 6,566,544 shares, respectively.
	The Company’s board of directors has approved and adopted a 2013 Performance Incentive Plan, or the 2013 Plan, in connection with the initial public offering. The Company’s shareholders have approved the 2013 Plan, which has become effective upon the completion of the initial public offering. A total of 1,600,000 ordinary shares will be authorized for issuance with respect to awards granted under the 2013 Plan. The share limit will automatically increase on the first trading day in January of each year (commencing with January 2014) by an amount equal to the lesser of (1) 4% of the total number of outstanding shares of our ordinary shares on the last trading day in December in the prior year, (2) 1,000,000 shares, or such lesser number as determined by our board of directors.
	Awards under the 2013 Plan may be in the form of incentive or nonqualified share options, share appreciation rights, share bonuses, restricted share and other forms of awards including cash awards. Awards under the plan generally will not be transferable other than by will or the laws of descent and distribution, except that the plan administrator may authorize certain transfers.

	Nonqualified and incentive share options may not be granted at prices below the fair market value of the ordinary shares on the date of grant. Incentive share options must have an exercise price that is at least equal to the fair market value of our ordinary shares, or 110% of fair market value of our ordinary shares or incentive share option grants to any 10% owner of our ordinary shares, on the date of grant. These and other awards may also be issued solely or in part for services. Awards are generally paid in cash or shares of our ordinary shares. The plan administrator may provide for the deferred payment of awards and may determine the terms applicable to deferrals.
	The 2013 Plan will terminate on the tenth anniversary of the date our board adopts it. However, the plan administrator will retain its authority until all outstanding awards are exercised or terminated. The maximum term of options, share appreciation rights and other rights to acquire ordinary shares under the plan is ten years after the initial date of the award.
	Employees, officers, directors and consultants that provide services to the Company or one of the Company’s subsidiaries may be selected to receive awards under the 2013 Plan and the compensation committee of the Company’s board of directors will be the administrator under the 2013 Plan. Awards under the 2013 Plan may be in the form of incentive or nonqualified share options, share appreciation rights, share bonuses, restricted share and other forms of awards including cash awards.
	Share Options
	The Company uses the Black-Scholes valuation model to calculate the fair value of share options. The fair value of share options granted to employees is estimated as of the grant date. The fair value of the share options granted to non-employees is re-measured at each reporting date. The assumptions used in valuation were as follows:


			Three Months Ended September 30,				Nine Months Ended September 30,
			2013		2012		2013		2012
	Risk-free interest rate		2.52%-3.53%		1.10-2.61%		1.11-3.53%		1.10-3.13%
	Expected term (in years)		6 to 10		6 to 10		6 to 10		6 to 10
	Dividend yield		—		—		—		—
	Volatility		48.04%-49.75%		43.81%-50.40%		39.69%-49.75%		43.81%-52.66%
	The risk-free interest rate assumption was based on the yield-to-maturity of the government bond with the longest maturity in the respective countries in which the Company operates.
	The assumed dividend yield was based on the Company’s expectation of not paying dividends in the foreseeable future.
	The expected term was estimated based on the date of the grant, expiration date and vesting period as stated in the share option grant. The expected term was 6 years for employees and, for subsequent re-measurement of options granted to non-employee consultants, the expected term is calculated based on the remaining life of options of originally 10 years.
	Due to the Company’s limited historical data, the estimated volatility incorporated the historical volatility of comparable companies whose share prices are publicly available.
	Early Exercise of Employee Share Options
	Certain share options granted under the Company’s Plan provide option holders the right to elect to exercise unvested options in exchange for restricted ordinary shares. Restricted shares, which amounted to 7,500 shares and 0 shares as of September 30, 2013 and December 30, 2012, respectively, are subject to a repurchase right held by the Company at the lower of (a) the fair market value of the restricted ordinary shares at the time of the termination, or (b) the original purchase price of the restricted ordinary shares, upon termination of the holder’s status as an employee or consultant. For exercises of employee options, this right usually lapses 25% on the first anniversary of the vesting start date and in 36 equal monthly amounts thereafter. These repurchase terms are considered to be a forfeiture provision and do not result in variable accounting. In accordance with authoritative guidance, the cash received from option holders for the exercise of unvested options is treated as a refundable deposit shown as a liability in the Company’s unaudited condensed consolidated financial statements. As of September 30, 2013 and December 31, 2012 cash received for early exercise of options totaled $8 and $0, respectively.

	Total fair value for share options vested during the nine months ended September 30, 2013 was $1,100.
	The total compensation cost related to all unvested share option grants not yet recognized as of September 30, 2013 was $13,091 and the weighted-average period over which these grants are expected to vest is 3.69 years.
	Share Options to Employees and Consultants
	The following table summarizes the details related to stock options granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:


			Number of				Weighted				Weighted			Aggregate
			Shares				Average				Average			Intrinsic
							Exercise				Remaining			Value
							Price				Contractual
											Life
	Balance at December 31, 2012			2,734,688			$	2.4
	Granted			1,330,760				17.68
	Exercised			263,667				0.3
	Forfeited			26,019				10.64
	Canceled			4,669				0.99

	Outstanding at September 30, 2013			3,771,093			$	7.89				7		$	28,412
	Exercisable at September 30, 2013			3,146,996			$	7.21				6.61		$	25,571

	Vested at September 30, 2013			1,883,245			$	1.34				4.74		$	24,225

	Vested and expected to vest at September 30, 2013			3,611,003			$	7.54				6.89		$	28,202

	The Company recognized share-based compensation expense for options as follows (in thousands):


			Three Months Ended								Nine Months Ended
			September 30,								September 30,
			2013				2012				2013			2012
	Operating Expenses
	Cost of net revenue		$	15			$	5			$	30		$	15
	Research and development			316				137				715			347
	Sales, general and administrative			552				151				1,213			320
	The following table summarizes information about share options outstanding as of September 30, 2013:


														Share Options
		Share Options Outstanding											Exercisable
Range of Exercise Prices		Shares				Weighted				Weighted			Shares			Weighted
		Outstanding				Average				Average			Exercisable			Average
						Remaining				Exercise						Exercise
						Contractual				Price						Price
						Term
						(in years)
$0.13 - $0.25			789,600				2.75			$	0.13			789,600		$	0.13
$0.40 - $1.03			758,480				5.24				0.96			735,166			0.96
$2.20 - $9.43			897,253				8.44				6.11			581,830			6.08
$16.03 - $17.85			1,325,760				9.56				17.68			1,040,400			17.64

			3,771,093				7			$	7.89			3,146,996		$	7.21


Restricted Share Awards
On April 23, 2013, the Company granted 317,120 restricted shares with non-forfeitable dividend right under the Company’s 2006 Share Incentive Plan and these restricted shares are entitled to cash dividends with respect to the Restricted Shares subject to the award even though such shares are not vested. Therefore, pursuant to ASC 260-10-45-61A, these restricted shares are participating securities and related unvested restricted shares are included in the computation of basic net income per share under the two-class method.
The following table summarizes the details related to RSAs, granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:


						Weighted-Average
		Number				Grant Date Fair
		of Shares				Value Per Share
Balance at December 31, 2012			—			$	—
Granted			330,620				17.98
Vested			—				—
Forfeited			8,200				17.98

Outstanding at September 30, 2013			322,420	(*)		$	17.98


(*)	The restricted shares are not included in the outstanding ordinary shares due to their restrictions.
The estimated fair value on the grant date of RSAs was $17.98 per share and the share-based compensation expense related to these awards is calculated based on the estimated fair value of the Company’s ordinary shares on the date of grant, multiplied by the number of RSAs granted. The share-based compensation expense, less the forfeitures, is recorded on a straight-line basis over the requisite service period of the RSAs. As of September 30, 2013, there was $4,698 of unrecognized compensation costs, net of forfeitures related to RSAs granted under the Company’s 2006 Share Incentive Plan. The unrecognized compensation cost is expected to be recognized over a weighted average period of 3.97 years.
In connection with the grant of the RSAs to all participants, the Company recorded share-based compensation of $504 for the nine months ended September 30, 2013.
The Company recognized share-based compensation expense for RSAs as follows (in thousands):


		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2013				2012				2013			2012
Operating Expenses
Cost of net revenue		$	19			$	—			$	32		$	—
Research and development			230				—				409			—
Sales, general and administrative			36				—				63			—

Income_Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	13. Income Taxes
	The Company adopted ASC 740-270 approach for interim period tax computation and reporting. The Company recorded an income tax provision of $737, $427, $1,709 and $980 for the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, respectively.
	The effective tax rate for the three and nine months ended September 30, 2013 was 8.4% and 9.2%, respectively, and 6.3% and 6.3% in the comparable periods of 2012, respectively. The difference between the effective tax rates and the statutory rate resulted primarily due to the foreign rate differential. The tax rate increase was mainly due to the increase in the total income before tax and the increase in income before tax in the jurisdictions with higher tax rates compared to the prior year as a result of the implementation of the new international structure.

	During the three and nine months ended September 30, 2013, the gross amount of the Company’s unrecognized tax benefits did not have a significant increase or decrease because there has been no change in tax positions taken during the current year. Substantially all of the unrecognized tax benefits as of September 30, 2013, $6.9 million, if recognized, would affect the Company’s effective tax rate. As of September 30, 2013, the Company does not expect any significant increases or decreases to its unrecognized tax benefits within the next 12 months.

Segment_and_Geographic_Informa

Segment and Geographic Information	9 Months Ended
Segment and Geographic Information	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment and Geographic Information	'
	14. Segment and Geographic Information
	The Company operates in one segment related to the design, development and sale of high performance, low power semiconductors for the home entertainment and cloud computing markets. The Company’s chief operating decision maker is its chief executive officer, who reviews the Company’s operating results on an aggregate basis for the purpose of evaluating financial performance and allocating resources.
	The following table sets forth the Company’s revenue by geographic region:


		Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
	Hong Kong	$	27,618	$	18,421	$	68,404	$	50,002
	Asia Pacific		960		912		2,782		1,236
	United States		785		1,008		2,655		2,644
	Europe		693		260		1,607		656

		$	30,056	$	20,601	$	75,448	$	54,538

	As of September 30, 2013, substantially all of the Company’s long-lived tangible assets were located in the Asia Pacific region.
	The following table sets forth the Company’s revenue generated from sales of semiconductors solutions for the home entertainment and cloud computing markets:


		Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
	Home entertainment	$	27,255	$	18,649	$	68,371	$	50,614
	Cloud Computing market		2,801		1,952		7,077		3,924

		$	30,056	$	20,601	$	75,448	$	54,538

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	15. Commitments and Contingencies
	Future minimum lease payment under noncancelable operating leases having initial terms in excess of one year as of September 30, 2013 are as follows:


		Payment Due by Period
		Total		Less than		3-Jan		5-Mar
		Total		1 Year		Years		Years
		(in thousands)
	Operating lease obligations	$	2,461	$	315	$	1,877	$	269
	Purchase obligations		1,670		1,670		—		—

	Total contractual obligations	$	4,131	$	1,985	$	1,877	$	269

	As of September 30, 2013 and December 31, 2012, there was no unsettled or unasserted claim or litigation against the Company. Rent expense incurred under operating leases was $352 and $234 for the three months ended September 30, 2013 and 2012 and $917 and $517 for the nine months ended September 30, 2013 and 2012, respectively.

OffBalance_Sheet_Arrangements

Off-Balance Sheet Arrangements	9 Months Ended
Off-Balance Sheet Arrangements	Sep. 30, 2013
Text Block [Abstract]	'
Off-Balance Sheet Arrangements	'
	16. Off-Balance Sheet Arrangements
	As of September 30, 2013 and December 31, 2012, the Company did not have any transactions, obligations or relationships that could be considered off-balance sheet arrangements.

25for1_Reverse_Share_Split

2.5-for-1 Reverse Share Split	9 Months Ended
2.5-for-1 Reverse Share Split	Sep. 30, 2013
Equity [Abstract]	'
2.5-for-1 Reverse Share Split	'
	17. 2.5-for-1 Reverse Share Split
	On September 6, 2013, the Company’s shareholders approved and effected a reverse share split such that every 2.5 issued and unissued ordinary and preferred shares of par value US$0.005 were consolidated into one share with a par value of US$0.0125 each. All share-related disclosures, including par value, share price, number of ordinary shares, preferred shares, share options, restricted shares, and warrants, exercise price of share options, restricted shares, and warrants and related fair value per share, and net income per share calculations, have been recast to reflect the 2.5-for-1 reverse share split for all periods presented.

Subsequent_Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	18. Subsequent Events
	On September 24, 2013, the Company registration statement on Form S-1 (File No. 333-190761) was declared effective by the SEC for the initial public offering of 8,165,000 shares of ordinary shares. The offering was completed on October 1, 2013 (note 1b).
	Upon completion of the initial public offering of the Company on October 1, 2013, the Series A, B, B1 and B2 Convertible Preferred Shares automatically converted into 16,163,598 ordinary shares.

Pro_Forma_Balance_Sheet_and_Ne

Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares	'
	19. Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares
	The Series A, B, B-1 and B-2 convertible preferred shares automatically converted into ordinary shares based on the then effective conversion ratio immediately upon the closing of Qualified IPO on October 1, 2013. As the IPO was consummated after the September 30, 2013 date of these financial statements, the pro forma balance sheet as of September 30, 2013 assumes the Qualified IPO had occurred and presents an as adjusted financial position as if the conversion of the Series A, B, B-1 and B-2 convertible preferred shares into ordinary shares occurred on September 30, 2013 at the then conversion ratio of 1 for 1 (Series A, Series B issue on December 20, 2007 and Series B-2), 1 for 1.0173 (Series B issued on June 19, 2006) and 1 for 1.040 (Series B-1). Accordingly, the carrying value of the convertible preferred shares, in the amount of $54,400 was reclassified from Convertible Preferred Shares to ordinary shares and additional paid in capital for such pro forma presentation.

	The unaudited pro-forma income per share for the three months and the nine months ended September 30, 2013 after giving effect to the conversion of the Series A, B, B-1 and B-2 Preferred Shares into ordinary shares as if the closing occurred at the beginning of fiscal 2013 was as follows:


		For the Three Months		For the Nine Months
		Ended		Ended
		September 30, 2013		September 30, 2013
	Numerator:
	Actual net income attributable to ordinary shareholders	$	1,581	$	3,139
	Pro-forma effect of preferred shares		6,460		13,674

	Pro-form net income attributable to ordinary shareholders – Basic and diluted		8,041		16,813

	Denominator:
	Actual weighted average number of ordinary shares outstanding
	Basic		4,658,034		4,618,302
	Diluted		6,527,371		6,557,368
	Pro-forma effect of preferred shares		16,163,598		16,163,598

	Denominator for pro-forma basic and diluted calculation
	Basic		20,821,632		20,781,900

	Diluted		22,690,969		22,720,966

	Pro-forma basic and diluted net income per share attributable to ordinary shareholders
	Basic	$	0.39	$	0.81

	Diluted	$	0.35	$	0.74

	Certain equity awards are not included in the calculation of pro-forma diluted net income per share because of their anti-dilutive effect.

Restricted_Net_Assets

Restricted Net Assets	9 Months Ended
Restricted Net Assets	Sep. 30, 2013
Receivables [Abstract]	'
Restricted Net Assets	'
	20. Restricted Net Assets
	Regulations in the PRC currently permit payment of dividends of a PRC company only out of accumulated profits as determined in accordance with accounting standards and regulations in China. Under PRC law, the Company’s subsidiaries incorporated in China are required to set aside at least 10% of their after-tax profit based on PRC accounting standards each year to their general reserves until the cumulative amount reaches 50% of their paid-in capital. These reserves are not distributable as cash dividends, or as loans or advances.
	As a result of these and other restrictions under PRC laws and regulations, the PRC subsidiaries are restricted in their ability to transfer a portion of their net assets to the Company either in the form of dividends, loans or advances, which restricted portion amounted to approximately $10,749 and $10,749 of the Company’s total unaudited condensed consolidated net assets as of September 30, 2013 and December 31, 2012. Even though the Company currently does not require any such dividends, loans or advances from the PRC subsidiaries for working capital and other funding purposes, the Company may in the future require additional cash resources from our PRC subsidiaries due to changes in business conditions, to fund future acquisitions and developments, or merely declare and pay dividends to or distributions to the Company’s shareholders.
	For the nine months ended September 30, 2013, no dividends were declared by any of the Company’s subsidiaries.

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Organization

a. Organization

Initial Public Offering

b. Initial Public Offering

Basis of Presentation

c. Basis of Presentation

Use of Estimates

d. Use of Estimates

Significant Accounting Policies

e. Significant Accounting Policies

Recent Accounting Pronouncements

f. Recent Accounting Pronouncements

Concentration of Credit Risks

g. Concentration of Credit Risks

Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable.

The following table summarizes the percentage of the Company’s revenue and accounts receivable represented by distributors and customers with balances over 10% of total revenue:

For the Three Months Ended

For the Nine Months Ended

September 30,

Revenue

2012

2013

2012

2013

Company A

Company B

Accounts receivable

December 31, 2012

September 30, 2013

Company A

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary of Percentage of Revenue and Accounts Receivable Represented by Distributors and Customers	'
	The following table summarizes the percentage of the Company’s revenue and accounts receivable represented by distributors and customers with balances over 10% of total revenue:


		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
	Revenue	2012			2013			2012			2013
	Company A		58	%		73	%		43	%		71	%
	Company B		13	%		9	%		21	%		8	%


	Accounts receivable	December 31, 2012			September 30, 2013
	Company A		89	%		79	%

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	9 Months Ended
Net Income Per Share (Tables)	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Net Income Per Ordinary Share	'
	The following shows the computation of basic and diluted net income per ordinary share:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Numerator
	Net income	$	8,041		$	6,365		$	16,813		$	14,594
	Less: Accretion for preferred shares		—			(14	)		(23	)		(42	)
	Less: Allocation of net income to participating preferred shares and restricted shares		(6,460	)		(5,194	)		(13,651	)		(12,038	)

	Numerator for basic calculation		1,581			1,157			3,139			2,514
	Undistributed earnings re-allocated to ordinary share holders		455			397			926			847

	Numerator for diluted calculation	$	2,036		$	1,554		$	4,065		$	3,361

	Denominator
	Denominator for basic calculation, weighted-average number of shares of ordinary share outstanding		4,658,034			4,321,144			4,618,302			4,303,135
	Dilutive effect of share option		1,860,216			2,070,108			1,926,644			1,991,931
	Dilutive effect of restricted shares and awards		9,121			—			12,422			—

	Denominator for diluted calculation		6,527,371			6,391,252			6,557,368			6,295,066

	Net income per share
	Basic	$	0.34		$	0.27		$	0.68		$	0.58

	Diluted	$	0.31		$	0.24		$	0.62		$	0.53

Schedule of Anti-dilutive Shares not Included in Calculation of Diluted Net Income Per Share	'
	The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share because including them would be anti-dilutive as of the end of each period presented:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Convertible preferred shares		16,163,598			16,163,598			16,163,598			16,163,598
Schedule of Equity Awards not Included In Calculation of Diluted Net Income Per Share	'
	The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share for the corresponding periods because the number of shares calculated based on the assumed proceeds from exercise of the equity awards and the weighted average fair value of the Company’s ordinary shares is higher than the number of shares assumed to be issued under the awards:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Equity awards outstanding		1,768,960			403,520			1,726,480			417,120

Fair_Market_Value_of_Financial1

Fair Market Value of Financial Instruments (Tables)	9 Months Ended
Fair Market Value of Financial Instruments (Tables)	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Summary of Financial Instruments, Measured at Fair Value by Level within Fair Value Hierarchy	'
	The following table sets forth the financial instruments, measured at fair value by level within the fair value hierarchy as of December 31, 2012 and September 30, 2013:


				Fair value measure at reporting date using
	As of December 31, 2012	As of		Quoted Prices		Significant		Significant
		December 31,		in Active Markets		Other		Unobservable
		2012		for Identical Assets		Observable		Inputs
				(Level 1)		Inputs (Level 2)		(Level 3)
	Cash	$	12,175	$	12,175	$	—	$	—
	Time deposit within the maturity term below 3 months		9,405		9,405		—		—
	Short-term investments		6,472		—		6,472		—

	Total	$	28,052	$	21,580	$	6,472	$	—



				Fair value measure at reporting date using
	As of September 30, 2013	As of		Quoted Prices		Significant		Significant
		September 30,		in Active Markets		Other		Unobservable
		2013		for Identical Assets		Observable		Inputs
				(Level 1)		Inputs (Level 2)		(Level 3)
	Cash	$	27,414	$	27,414	$	—	$	—
	Bank investment product readily convertible within the maturity term below 3 months		9,759		—		9,759		—
	Time deposit with the maturity term below 3 months		4,008		4,008		—		—
	Time deposit with the maturity term greater than 3 months but less than 1 year		50		50		—		—
	Short-term investments		6,393		—		6,393		—

	Total	$	47,624	$	31,472	$	16,152	$	—

Inventories_Tables

Inventories (Tables)	9 Months Ended
Inventories (Tables)	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Components of Inventories	'
	Inventories consist of the following:


		As of		As of
		September 30, 2013		December 31, 2012
	Work in progress	$	5,491	$	3,665
	Finished goods		4,339		7,451

		$	9,830	$	11,116

Prepaid_Expenses_and_Other_Cur1

Prepaid Expenses and Other Current Assets (Tables)	9 Months Ended
Prepaid Expenses and Other Current Assets (Tables)	Sep. 30, 2013
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'
Schedule of Prepaid Expenses and Other Current Assets	'
	Prepaid expenses and other current assets consist of the following:


		As of		As of
		September 30, 2013		December 31, 2012
	Value-added tax recoverable	$	603	$	486
	Prepaid license fees		141		294
	Prepayment for material purchase		173		170
	Rental deposits		400		321
	Value-added tax refundable on export sales		489		306
	Other prepaid expenses and other current assets		785		423

		$	2,591	$	2,000

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	9 Months Ended
Property and Equipment, Net (Tables)	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Summary of Property and Equipment, Net	'
	Property and equipment, net consist of the following:


		As of			As of
		September 30, 2013			December 31, 2012
	Office and other equipment	$	3,862		$	3,193
	Furniture and fixtures		663			475
	Leasehold improvements		1,665			1,354

			6,190			5,022
	Less: accumulated depreciation and amortization		(3,731	)		(2,738	)

		$	2,459		$	2,284

Acquired_Intangible_Assets_Net1

Acquired Intangible Assets, Net (Tables)	9 Months Ended
Acquired Intangible Assets, Net (Tables)	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Summary of Acquired Intangible Assets, Net	'
	Acquired intangible assets, net consist of the following:


			As of			As of
			September 30, 2013			December 31, 2012
	Assembled workforce (1)		$	1,900		$	1,900
	Technology Licenses			116			150
	Software			265			—
	Montage Macao License (2)			129			—
	Less: accumulated amortization			(1,390	)		(554	)

			$	1,020		$	1,496


	-1	Assembled workforce
	On August 23, 2012, Montage Technology Hong Kong Limited, a wholly owned subsidiary of the Company, entered into agreements with a third party to acquire a research and development workforce, intellectual property (“IP”) and computers and office equipment for total cash consideration of $2,016. The acquisition has been completed in September 2012. The Company determined that the acquisition of research and development workforce, IP and computers and office equipment should be accounted for an asset acquisition as the group of assets acquired by the Company did not meet the definition of a business as pursuant to ASC 805. The Company allocated the total consideration to the acquired research and development workforce, IP (which was obsolete) and computers and office equipment with the amount of $1,900, $0 and $116, respectively, on the acquisition date. The research and development workforce is recorded as assembled workforce and amortized on a straight line basis over 18 months as the Company expected the acquired workforce to provide economic benefit to the Company during this period based on the Company’s prior experience in developing research and development workforce and conducting research and development activities.

	-2	Montage Macao license
	The Company entered into a memorandum of understanding to acquire Sonoma Commercial Offshore, Ltd, a Macao Offshore Company, which was subsequently renamed Montage Technology Commercial Offshore Limited (“Montage Macao”), to be the principal entity in the Company’s international corporate structure. The acquisition of Montage Macao was completed in May 2013 when Montage Macao completed its registration with the Macao government and the Company took control over Montage Macao. Montage Macao did not have any assets or liabilities other than a qualification license as a commercial offshore entity in Macao. The Company determined that the acquisition of Montage Macao shall be accounted for as an asset acquisition of its commercial offshore license qualification in Macao as it did not meet the definition of a business as pursuant to ASC 805-20-20 and ASC 805-10-55-4 through 805-10-55-9. The useful life of the commercial offshore license qualification in Macao is indefinite as long as the Company maintains its offshore business in Macao. Therefore, the acquisition cost of $129 for the commercial offshore license is not amortized and shall be tested for impairment annually or more frequently if events or changes in circumstances indicate that the commercial offshore license might be impaired pursuant to ASC 350-30-35-18 through 35-20.

Accrued_Liabilities_Tables

Accrued Liabilities (Tables)	9 Months Ended
Accrued Liabilities (Tables)	Sep. 30, 2013
Payables And Accruals [Abstract]	'
Schedule of Accrued Liabilities	'
	Accrued liabilities consist of the following:


			As of		As of
			September 30, 2013		December 31, 2012
	Government funding for research and development projects (1)		$	3,893	$	3,055
	Accrued employee compensation and other employee expenses			3,504		4,505
	Accrued research and development expenses			—		28
	Advances from customers			267		230
	Accrued warranty			187		149
	Accrued professional service fee			3,484		497
	Proceeds received for early exercised options			8		—
	Other accrued liabilities			598		644

			$	11,941	$	9,108


	-1	For the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, the Company recorded nil, $1,025, $396, and $1,025 government funding as a deduction to expense, respectively. The Company has not recorded any reduction to the carrying value of depreciable assets. As of December 31, 2012 and September 30, 2013, the Company has recorded an accrued liability for cash funding received from the PRC government of $3,055, and $3,893, respectively, because the government had not commenced its review of the research and development projects qualified for funding at the end of the respective periods.

Deferred_Margin_Net_Tables

Deferred Margin, Net (Tables)	9 Months Ended
Deferred Margin, Net (Tables)	Sep. 30, 2013
Revenue Recognition [Abstract]	'
Components of Deferred Margin, Net	'
	Deferred margin, net consists of the following:


			As of			As of
			September 30, 2013			December 31, 2012
	Deferred revenue		$	20,146		$	15,878
	Deferred cost of revenue			(18,601	)		(14,678	)

			$	1,545		$	1,200

Deferred Revenue and Deferred Cost of Revenue on Sales to Distributor	'
	The deferred revenue and deferred cost of revenue on sales to distributor activities for the nine months ended September 30, 2013 and 2012 were as follows:


			Nine Months Ended
			September 30,
			2013			2012
	Balance at the beginning of the period		$	1,200		$	5,147
	Revenue deferred upon shipment to distributors			33,847			27,734
	Cost of sales deferred upon shipments to distributors			(26,952	)		(18,509	)
	Revenue recognized upon resale from distributors to end customers			(29,126	)		(26,295	)
	Cost of sales recognized upon resale from distributors to end customers			23,029			13,126
	Price adjustments to distributors			(453	)		(195	)

	Balance at the end of the period		$	1,545			1,008

Revenue Recognized Upon Resale from Distributors to End Customers	'
	The following table shows reconciliation from revenue recognized upon resale from distributors to end customers as included in the above table to revenue recorded in the consolidated statements of operations and comprehensive income for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012:


			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013		2012
	Revenue recognized upon resale from distributors to end customers (through deferred revenue)		$	12,063		$	7,842		$	29,126	$	26,295
	Revenue recognized upon resale from LQW to end customers (recorded directly in revenue)*			15,136			9,171			38,115		17,998
	Revenue recognized for the Company’s sales directly to end customer			2,857			3,588			8,207		10,245

	Total		$	30,056		$	20,601		$	75,448	$	54,538


	*	LQW has been a distributor for the Company’s products since October 2011. The Company is entitled to bill only a portion of the total sale price at the time of shipment (deferred revenue), with the remainder billed upon sale by LQW to the end customer. The portion of the total sale price that the Company is not entitled to bill at the time of shipment to LQW is recorded directly in revenue upon sale by LQW to the end customers.

Convertible_Preferred_Shares_T

Convertible Preferred Shares (Tables)	9 Months Ended
Convertible Preferred Shares (Tables)	Sep. 30, 2013
Equity [Abstract]	'
Summary of Convertible Preferred Shares	'
	Convertible preferred shares consisted of the following as of September 30, 2013:


	Convertible				Par				Subscription				Shares						Carrying		Liquidation
					Value				Price										Amount		Value
					Per
	Preferred Shares		Issuance date		Share				Per Share				Authorized				Outstanding
	Series A		April 23, 2004 and
			August 31, 2004		$	0.0125			$	1.25				4,800,000				4,800,000	$	6,000	$	6,000
	Series B		19-Jun-06			0.0125				3.2263				4,681,416	(1)			3,325,843		13,949		10,730
	Series B issued upon exercise of warrant		December 20, 2007			0.0125				2.54								930,000		3,071		2,362
	Series B-1		18-May-07			0.0125				3.9985				4,551,709				4,049,276		21,048		16,191
	Series B-2		8-Oct-09
			22-Oct-09
			30-Jun-10			0.0125				2.799	(2)			3,571,514				2,839,409		10,332		7,947

														17,604,639				15,944,528	$	54,400	$	43,230



	-1	Authorized shares for Series B convertible preferred shares issued on June 19, 2006 also included shares authorized for Series B convertible preferred shares issued upon exercise of warrant on December 20, 2007.
	-2	Pursuant to the Company’s Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.
Summary of Accretion to Carrying Value of Convertible Preferred Shares	'
	For the three months and nine months ended September 30, 2012 and 2013, the accretion to the carrying value of convertible preferred shares was summarized as follows:


			For the Three Months Ended								For the Nine Months Ended
			September 30,								September 30,
			2013				2012				2013				2012
			(unaudited)				(unaudited)				(unaudited)				(unaudited)
	Series B-2			—			$	14			$	23			$	42

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	9 Months Ended
Share-Based Compensation (Tables)	Sep. 30, 2013
Assumptions Used in Valuation of Fair Value of Share Options Granted	'
	The Company uses the Black-Scholes valuation model to calculate the fair value of share options. The fair value of share options granted to employees is estimated as of the grant date. The fair value of the share options granted to non-employees is re-measured at each reporting date. The assumptions used in valuation were as follows:


			Three Months Ended September 30,			Nine Months Ended September 30,
			2013		2012	2013		2012
	Risk-free interest rate		2.52%-3.53%		1.10-2.61%	1.11-3.53%		1.10-3.13%
	Expected term (in years)		6 to 10		6 to 10	6 to 10		6 to 10
	Dividend yield		—		—	—		—
	Volatility		48.04%-49.75%		43.81%-50.40%	39.69%-49.75%		43.81%-52.66%
Summary of Stock Options Granted and Outstanding Under 2006 Share Incentive Plan	'
	The following table summarizes the details related to stock options granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:


			Number of			Weighted			Weighted		Aggregate
			Shares			Average			Average		Intrinsic
						Exercise			Remaining		Value
						Price			Contractual
									Life
	Balance at December 31, 2012			2,734,688		$	2.4
	Granted			1,330,760			17.68
	Exercised			263,667			0.3
	Forfeited			26,019			10.64
	Canceled			4,669			0.99

	Outstanding at September 30, 2013			3,771,093		$	7.89			7	$	28,412
	Exercisable at September 30, 2013			3,146,996		$	7.21			6.61	$	25,571

	Vested at September 30, 2013			1,883,245		$	1.34			4.74	$	24,225

	Vested and expected to vest at September 30, 2013			3,611,003		$	7.54			6.89	$	28,202

Summary of Information about Share Options Outstanding	'
	The following table summarizes information about share options outstanding as of September 30, 2013:


											Share Options
			Share Options Outstanding								Exercisable
	Range of Exercise Prices		Shares			Weighted			Weighted		Shares		Weighted
			Outstanding			Average			Average		Exercisable		Average
						Remaining			Exercise				Exercise
						Contractual			Price				Price
						Term
						(in years)
	$0.13 - $0.25			789,600			2.75		$	0.13		789,600	$	0.13
	$0.40 - $1.03			758,480			5.24			0.96		735,166		0.96
	$2.20 - $9.43			897,253			8.44			6.11		581,830		6.08
	$16.03 - $17.85			1,325,760			9.56			17.68		1,040,400		17.64

				3,771,093			7		$	7.89		3,146,996	$	7.21

Summary of Details Related to RSAs, Granted and Outstanding	'
	The following table summarizes the details related to RSAs, granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:


						Weighted-Average
			Number			Grant Date Fair
			of Shares			Value Per Share
	Balance at December 31, 2012			—		$	—
	Granted			330,620			17.98
	Vested			—			—
	Forfeited			8,200			17.98

	Outstanding at September 30, 2013			322,420	(*)	$	17.98


	(*)	The restricted shares are not included in the outstanding ordinary shares due to their restrictions.
Share Options [Member]	'
Schedule of Recognized Share-Based Compensation Expense	'
	The Company recognized share-based compensation expense for options as follows (in thousands):


			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013		2012
	Operating Expenses
	Cost of net revenue		$	15		$	5		$	30	$	15
	Research and development			316			137			715		347
	Sales, general and administrative			552			151			1,213		320
Restricted Share Awards [Member]	'
Schedule of Recognized Share-Based Compensation Expense	'
	The Company recognized share-based compensation expense for RSAs as follows (in thousands):


			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013		2012
	Operating Expenses
	Cost of net revenue		$	19		$	—		$	32	$	—
	Research and development			230			—			409		—
	Sales, general and administrative			36			—			63		—

Segment_and_Geographic_Informa1

Segment and Geographic Information (Tables)	9 Months Ended
Segment and Geographic Information (Tables)	Sep. 30, 2013
Segment Reporting [Abstract]	'
Summary of Company's Revenue by Geographic Region	'
	The following table sets forth the Company’s revenue by geographic region:


		Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
	Hong Kong	$	27,618	$	18,421	$	68,404	$	50,002
	Asia Pacific		960		912		2,782		1,236
	United States		785		1,008		2,655		2,644
	Europe		693		260		1,607		656

		$	30,056	$	20,601	$	75,448	$	54,538

Summary of Company's Revenue Generated from Sales of Semiconductors Solutions	'
	The following table sets forth the Company’s revenue generated from sales of semiconductors solutions for the home entertainment and cloud computing markets:


		Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
	Home entertainment	$	27,255	$	18,649	$	68,371	$	50,614
	Cloud Computing market		2,801		1,952		7,077		3,924

		$	30,056	$	20,601	$	75,448	$	54,538

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
Commitments and Contingencies (Tables)	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Summary of Future Minimum Lease Payment under Noncancelable Operating Leases	'
	Future minimum lease payment under noncancelable operating leases having initial terms in excess of one year as of September 30, 2013 are as follows:


		Payment Due by Period
		Total		Less than		3-Jan		5-Mar
		Total		1 Year		Years		Years
		(in thousands)
	Operating lease obligations	$	2,461	$	315	$	1,877	$	269
	Purchase obligations		1,670		1,670		—		—

	Total contractual obligations	$	4,131	$	1,985	$	1,877	$	269

Pro_Forma_Balance_Sheet_and_Ne1

Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Schedule of Unaudited Pro-Forma Income per Share	'
	The unaudited pro-forma income per share for the three months and the nine months ended September 30, 2013 after giving effect to the conversion of the Series A, B, B-1 and B-2 Preferred Shares into ordinary shares as if the closing occurred at the beginning of fiscal 2013 was as follows:


		For the Three Months		For the Nine Months
		Ended		Ended
		September 30, 2013		September 30, 2013
	Numerator:
	Actual net income attributable to ordinary shareholders	$	1,581	$	3,139
	Pro-forma effect of preferred shares		6,460		13,674

	Pro-form net income attributable to ordinary shareholders – Basic and diluted		8,041		16,813

	Denominator:
	Actual weighted average number of ordinary shares outstanding
	Basic		4,658,034		4,618,302
	Diluted		6,527,371		6,557,368
	Pro-forma effect of preferred shares		16,163,598		16,163,598

	Denominator for pro-forma basic and diluted calculation
	Basic		20,821,632		20,781,900

	Diluted		22,690,969		22,720,966

	Pro-forma basic and diluted net income per share attributable to ordinary shareholders
	Basic	$	0.39	$	0.81

	Diluted	$	0.35	$	0.74

Organization_and_Summary_of_Si3

Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 06, 2013	Oct. 02, 2013
	Sep. 06, 2013	Subsequent Events [Member]
Organization And Significant Accounting Policies [Line Items]	'	'
Initial public offering, ordinary shares issued	'	8,165,000
Initial public offering, price per share	'	$10
Initial public offering, additional shares issued	'	5,325,000
Initial public offering, shares sold by shareholders	'	2,840,000
Proceeds from issuance of ordinary shares	'	$49.50
Underwriting discounts and commissions	'	3.7
Other offering expenses	'	$3.20
Ordinary shares issued upon conversion of Convertible Preferred Shares	'	16,163,598
Reverse share split	'2.5-for-1	'

Organization_and_Summary_of_Si4

Organization and Summary of Significant Accounting Policies - Summary of Percentage of Revenue and Accounts Receivable Represented by Distributors and Customers (Detail)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
	Revenue [Member]	Revenue [Member]	Revenue [Member]	Revenue [Member]	Revenue [Member]	Revenue [Member]	Revenue [Member]	Revenue [Member]	Accounts Receivable [Member]	Accounts Receivable [Member]
	Company A [Member]	Company A [Member]	Company A [Member]	Company A [Member]	Company B [Member]	Company B [Member]	Company B [Member]	Company B [Member]	Company A [Member]	Company A [Member]
Concentration Risk [Line Items]	'	'	'	'	'	'	'	'	'	'
Percentage of revenue and accounts receivable	73.00%	58.00%	71.00%	43.00%	9.00%	13.00%	8.00%	21.00%	79.00%	89.00%

Net_Income_Per_Share_Computati

Net Income Per Share - Computation of Basic and Diluted Net Income Per Ordinary Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator	'	'	'	'
Net income	$8,041	$6,365	$16,813	$14,594
Less: Accretion for preferred shares	'	-14	-23	-42
Less: Allocation of net income to participating preferred shares and restricted shares	-6,460	-5,194	-13,651	-12,038
Numerator for basic calculation	1,581	1,157	3,139	2,514
Undistributed earnings re-allocated to ordinary share holders	455	397	926	847
Numerator for diluted calculation	$2,036	$1,554	$4,065	$3,361
Denominator	'	'	'	'
Denominator for basic calculation, weighted-average number of shares of ordinary share outstanding	4,658,034	4,321,144	4,618,302	4,303,135
Dilutive effect of share option	1,860,216	2,070,108	1,926,644	1,991,931
Dilutive effect of restricted shares and awards	9,121	'	12,422	'
Denominator for diluted calculation	6,527,371	6,391,252	6,557,368	6,295,066
Net income per share	'	'	'	'
Basic	$0.34	$0.27	$0.68	$0.58
Diluted	$0.31	$0.24	$0.62	$0.53

Net_Income_Per_Share_Additiona

Net Income Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 23, 2013	Sep. 30, 2013
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Restricted Share Awards [Member]	Restricted Share Awards [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]	'	'	'	'	'	'
Number of restricted shares, granted	'	'	'	'	317,120	330,620
Noncumulative dividends percentage	'	'	8.00%	'	'	'
Noncumulative dividend of preferred shares	$865	$865	$2,594	$2,594	'	'
Undistributed earnings attributable to preferred shares	5,595	4,329	11,057	9,444	'	'
Undistributed earnings re-allocated to ordinary share holders	$455	$397	$926	$847	'	'

Net_Income_Per_Share_Schedule_

Net Income Per Share - Schedule of Anti-dilutive Shares not Included in Calculation of Diluted Net Income Per Share (Detail) (Convertible Preferred Shares [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Convertible Preferred Shares [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Shares excluded from calculation of diluted net income per share	16,163,598	16,163,598	16,163,598	16,163,598

Net_Income_Per_Share_Schedule_1

Net Income Per Share - Schedule of Equity Awards not Included In Calculation of Diluted Net Income Per Share (Detail) (Equity awards outstanding [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity awards outstanding [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Shares excluded from calculation of diluted net income per share	1,768,960	403,520	1,726,480	417,120

Fair_Market_Value_of_Financial2

Fair Market Value of Financial Instruments - Summary of Financial Instruments, Measured at Fair Value by Level within Fair Value Hierarchy (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	$47,624	$28,052
Cash [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	27,414	12,175
Bank Investment Product Readily Convertible Within the Maturity Term Below 3 Months [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	9,759	'
Time Deposit Within the Maturity Term Below 3 Months [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	4,008	9,405
Time Deposit With the Maturity Term Greater Than 3 Months but Less Than 1 Year [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	50	'
Short-Term Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	6,393	6,472
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	31,472	21,580
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Cash [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	27,414	12,175
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Time Deposit Within the Maturity Term Below 3 Months [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	4,008	9,405
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Time Deposit With the Maturity Term Greater Than 3 Months but Less Than 1 Year [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	50	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	16,152	6,472
Significant Other Observable Inputs (Level 2) [Member] \| Bank Investment Product Readily Convertible Within the Maturity Term Below 3 Months [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	9,759	'
Significant Other Observable Inputs (Level 2) [Member] \| Short-Term Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial instruments, measured at fair value	$6,393	$6,472

Fair_Market_Value_of_Financial3

Fair Market Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value Disclosures [Abstract]	'	'	'	'
Change in fair value of short-term investments	$182	$43	$344	$63

Inventories_Components_of_Inve

Inventories - Components of Inventories (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]	'	'
Work in progress	$5,491	$3,665
Finished goods	4,339	7,451
Inventories	$9,830	$11,116

Inventories_Additional_Informa

Inventories - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Restatement Adjustment [Member]	Restatement Adjustment [Member]
Inventory [Line Items]	'	'	'	'	'	'	'
Finished goods	$4,339	'	$4,339	'	$7,451	$7,373	$5,464
Inventory write-downs	109	23	414	204	'	'	'
Inventory reserve balance	$1,321	'	$1,321	'	$2,406	'	'

Prepaid_Expenses_and_Other_Cur2

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]	'	'
Value-added tax recoverable	$603	$486
Prepaid license fees	141	294
Prepayment for material purchase	173	170
Rental deposits	400	321
Value-added tax refundable on export sales	489	306
Other prepaid expenses and other current assets	785	423
Prepaid expenses and other current assets, total	$2,591	$2,000

Property_and_Equipment_Net_Sum

Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]	'	'
Office and other equipment	$3,862	$3,193
Furniture and fixtures	663	475
Leasehold improvements	1,665	1,354
Property and equipment, gross	6,190	5,022
Less: accumulated depreciation and amortization	-3,731	-2,738
Property and equipment, net	$2,459	$2,284

Property_and_Equipment_Net_Add

Property and Equipment, Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property Plant And Equipment [Abstract]	'	'	'	'
Depreciation expense	$310	$207	$929	$482

Acquired_Intangible_Assets_Net2

Acquired Intangible Assets, Net - Summary of Acquired Intangible Assets, Net (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Acquired Intangible Assets [Line Items]	'	'
Less: accumulated amortization	($1,390)	($554)
Acquired intangible assets, net	1,020	1,496
Montage Macao License [Member]	'	'
Acquired Intangible Assets [Line Items]	'	'
Acquired intangible assets	129	'
Assembled Workforce [Member]	'	'
Acquired Intangible Assets [Line Items]	'	'
Acquired intangible assets, gross	1,900	1,900
Technology Licenses [Member]	'	'
Acquired Intangible Assets [Line Items]	'	'
Acquired intangible assets, gross	116	150
Software [Member]	'	'
Acquired Intangible Assets [Line Items]	'	'
Acquired intangible assets, gross	$265	'

Acquired_Intangible_Assets_Net3

Acquired Intangible Assets, Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]	'	'	'	'
Amortization expense	$324	$124	$986	$162

Acquired_Intangible_Assets_Net4

Acquired Intangible Assets, Net - Summary of Acquired Intangible Assets, Net (Parenthetical) (Detail) (USD $)	9 Months Ended			0 Months Ended		1 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Aug. 23, 2012	Aug. 23, 2012	Aug. 23, 2012	31-May-13
	Sep. 30, 2013	Sep. 30, 2012	Aug. 23, 2012	Assembled Workforce [Member]	Intellectual Property [Member]	Montage Macao License [Member]
Acquired Intangible Assets [Line Items]	'	'	'	'	'	'
Consideration for assets acquired	'	'	$2,016	'	'	'
Cash consideration for intangible assets	'	'	'	1,900	0	'
Cash consideration for computers and office equipment	'	'	116	'	'	'
Research and development workforce, amortization period	'	'	'	'18 months	'	'
Cash consideration for intangible assets	$484	$950	'	'	'	$129

ShortTerm_Loans_Additional_Inf

Short-Term Loans - Additional Information (Detail)	Dec. 31, 2012
Debt Disclosure [Abstract]	'
Short-term bank loans outstanding, weighted average interest rate per annum	5.88%

Accrued_Liabilities_Schedule_o

Accrued Liabilities - Schedule of Accrued Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]	'	'
Government funding for research and development projects	$3,893	$3,055
Accrued employee compensation and other employee expenses	3,504	4,505
Accrued research and development expenses	'	28
Advances from customers	267	230
Accrued warranty	187	149
Accrued professional service fee	3,484	497
Proceeds received for early exercised options	8	'
Other accrued liabilities	598	644
Accrued liabilities	$11,941	$9,108

Accrued_Liabilities_Schedule_o1

Accrued Liabilities - Schedule of Accrued Liabilities (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Payables And Accruals [Abstract]	'	'	'	'	'
Government funding deduction to expense	'	$1,025	$396	$1,025	'
Government funding for research and development projects	$3,893	'	$3,893	'	$3,055

Deferred_Margin_Net_Components

Deferred Margin, Net - Components of Deferred Margin, Net (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Deferred Revenue Disclosure [Abstract]	'	'	'	'
Deferred revenue	$20,146	$15,878	'	'
Deferred cost of revenue	-18,601	-14,678	'	'
Deferred margin, net	$1,545	$1,200	$1,008	$5,147

Deferred_Margin_Net_Deferred_R

Deferred Margin, Net - Deferred Revenue and Deferred Cost of Revenue on Sales to Distributor (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Deferred Revenue Disclosure [Abstract]	'	'
Balance at the beginning of the period	$1,200	$5,147
Revenue deferred upon shipment to distributors	33,847	27,734
Cost of sales deferred upon shipments to distributors	-26,952	-18,509
Revenue recognized upon resale from distributors to end customers	-29,126	-26,295
Cost of sales recognized upon resale from distributors to end customers	23,029	13,126
Price adjustments to distributors	-453	-195
Balance at the end of the period	$1,545	$1,008

Deferred_Margin_Net_Revenue_Re

Deferred Margin, Net - Revenue Recognized Upon Resale from Distributors to End Customers (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Deferred Margin, Net [Line Items]	'	'	'	'
Revenue	$30,056	$20,601	$75,448	$54,538
Resale from Distributors to End Customers [Member]	'	'	'	'
Deferred Margin, Net [Line Items]	'	'	'	'
Revenue	12,063	7,842	29,126	26,295
Resale from LQW to End Customers [Member]	'	'	'	'
Deferred Margin, Net [Line Items]	'	'	'	'
Revenue	15,136	9,171	38,115	17,998
Sales Directly to End Customers [Member]	'	'	'	'
Deferred Margin, Net [Line Items]	'	'	'	'
Revenue	$2,857	$3,588	$8,207	$10,245

Convertible_Preferred_Shares_S

Convertible Preferred Shares - Summary of Convertible Preferred Shares (Detail) (USD $)

Sep. 06, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Jun. 30, 2010

Sep. 30, 2013

In Thousands, except Share data, unless otherwise specified

Series A Convertible Preferred Shares [Member]

Series B Convertible Preferred Shares [Member]

Series B Issued Upon Exercise of Warrant [Member]

Series B-1 Convertible Preferred Shares [Member]

Series B-2 Convertible Preferred Share [Member]

Convertible Preferred Shares [Member]

Date 1 [Member]

Date 2 [Member]

Date 1 [Member]

Date 2 [Member]

Date 3 [Member]

Temporary Equity [Line Items]

Convertible Preferred Shares, Weighted Average Subscription Price Per Share

$2.80

[1]

Convertible Preferred Shares, Issuance date

23-Apr-04

31-Aug-04

19-Jun-06

20-Dec-07

18-May-07

8-Oct-09

22-Oct-09

30-Jun-10

Convertible Preferred Shares, Par Value Per Share

$0.01

Convertible Preferred Shares, Subscription Price Per Share

$1.25

$3.23

$2.54

$4.00

Convertible Preferred Shares, Shares Authorized

4,800,000

4,681,416

[2]

4,551,709

3,571,514

17,604,639

Convertible preferred shares, shares outstanding

4,800,000

4,255,843

3,325,843

930,000

4,049,276

2,839,409

15,944,528

Convertible Preferred Shares, Carrying Amount

$6,000

$17,020

$13,949

$3,071

$21,048

$10,332

$54,400

Convertible preferred shares, liquidation value

$6,000

$13,092

$10,730

$2,362

$16,191

$7,947

$43,230

[1]

Pursuant to the Company's Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.

[2]

Authorized shares for Series B convertible preferred shares issued on June 19, 2006 also included shares authorized for Series B convertible preferred shares issued upon exercise of warrant on December 20, 2007.

Convertible_Preferred_Shares_A

Convertible Preferred Shares - Additional Information (Detail) (USD $)

9 Months Ended

0 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Oct. 02, 2013

Sep. 30, 2013

Jun. 30, 2010

Sep. 30, 2013

Aug. 18, 2010

Sep. 30, 2013

Aug. 18, 2010

Sep. 30, 2013

Subsequent Events [Member]

Qualified IPO [Member]

Series B-2 Convertible Preferred Share [Member]

Series B Convertible Preferred Shares [Member]

Series B-1 Convertible Preferred Shares [Member]

Series A Convertible Preferred Shares [Member]

Minimum [Member]

Temporary Equity [Line Items]

Gross proceeds from sale of ordinary shares

$50,000,000

Sale price per share

$10

Share reserved as available for conversion of preferred share

16,163,598

Weighted Average Subscription price per share

$2.80

[1]

Conversion price of preferred shares

$3.17

$3.85

Number of common shares issued for conversion of convertible preferred shares

1.0173

1.04

Convertible preferred shares dividend percentage on issuance price

8.00%

Convertible preferred shares, liquidation preference percentage of subscription price

100.00%

Terms of redemption rights

'The holders of the Companybs Series B and B-1 preferred shares hold redemption rights such that at any time after June 19, 2011, if at least two-thirds of the holders of Series B and B-1 convertible preferred shares, voting together, elect to redeem their shares, the Company shall redeem all Series B and B-1 convertible preferred shares. The holders of the Companybs Series B-2 convertible preferred shares hold redemption rights such that at any time after June 1, 2013, if at least two-thirds of the holders of Series B-2 elect to redeem their shares, the Company shall redeem all Series B-2 convertible preferred shares. The redemption price available to Series B, B-1 and B-2 shall be 130% of subscription price per share, plus all declared and unpaid dividends.According to the shareholders' resolution dated August 13, 2013, the first possible redemption dates of the Company's Series B, B-1 and B-2 preferred shares were amended to January 1, 2014, respectively.

Convertible preferred shares redemption percentage of subscription price

130.00%

The aggregate amount of redemption for all issued redeemable preferred shares each year for five years

$48,400,000

Ordinary shares issued upon conversion of Convertible Preferred Shares

16,163,598

[1]

Convertible_Preferred_Shares_S1

Convertible Preferred Shares - Summary of Accretion to Carrying Value of Convertible Preferred Shares (Detail) (Series B-2 Convertible Preferred Share [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Series B-2 Convertible Preferred Share [Member]	'	'	'	'
Temporary Equity [Line Items]	'	'	'	'
Convertible Preferred Shares, Accretion to the Carrying Value	'	$14	$23	$42

ShareBased_Compensation_Additi

Share-Based Compensation - Additional Information (Detail) (USD $)

9 Months Ended

12 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Apr. 23, 2013

Sep. 30, 2013

2006 Share Incentive Plan [Member]

Early Exercise of Employee Share Options [Member]

Share Options [Member]

2013 Performance Incentive Plan [Member]

Share Options [Member]

Non-Employee Stock Option [Member]

Restricted Share Awards [Member]

Installment

2006 Share Incentive Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period

'4 years

Expiry period from date of grant

'10 years

Vesting percentage

25.00%

Number of ordinary shares authorized under equity award issuance plan

6,566,544

1,600,000

Incentive plan description

'Share options granted vest over a maximum period of four years and expire ten years from the date of the grant. Share options generally vest over four years, one-quarter on the first anniversary of the date of the grant and monthly thereafter for the remaining three years. RSAs have various vesting periods determined by the plan administrator, and generally vest over four years, with 25% on each of the anniversary of the vesting commence date.

'The share limit will automatically increase on the first trading day in January of each year (commencing with January 2014) by an amount equal to the lesser of (1) 4% of the total number of outstanding shares of our ordinary shares on the last trading day in December in the prior year, (2) 1,000,000 shares, or such lesser number as determined by our board of directors.

Percentage of fair market value of ordinary shares on date of grant

110.00%

Percentage of incentive grant options grant to ownership of ordinary shares

10.00%

Expected term

'6 years

'10 years

Unvested shares

7,500

Options vested, exercisable

Cash received from early exercise of options

Total fair value for stock options vested

1,100

Unrecognized compensation cost

13,091

4,698

Expected weighted-average period of compensation cost to be recognized

'3 years 8 months 9 days

'3 years 11 months 19 days

Number of restricted shares, granted

317,120

330,620

Estimated fair value of RSA

$17.98

Share-based compensation expense

$2,462

$682

$504

ShareBased_Compensation_Assump

Share-Based Compensation - Assumptions Used in Valuation of Fair Value of Share Options Granted (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Risk-free interest rate, minimum	2.52%	1.10%	1.11%	1.10%
Risk-free interest rate, maximum	3.53%	2.61%	3.53%	3.13%
Dividend yield	'	'	'	'
Volatility, minimum	48.04%	43.81%	39.69%	43.81%
Volatility, maximum	49.75%	50.40%	49.75%	52.66%
Minimum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expected term (in years)	'6 years	'6 years	'6 years	'6 years
Maximum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expected term (in years)	'10 years	'10 years	'10 years	'10 years

ShareBased_Compensation_Summar

Share-Based Compensation - Summary of Stock Options Granted and Outstanding Under 2006 Share Incentive Plan (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Number of Shares, Outstanding, Beginning Balance	2,734,688
Number of Shares, Granted	1,330,760
Number of Shares, Exercised	263,667
Number of Shares, Forfeited	26,019
Number of Shares, Canceled	4,669
Number of Shares, Outstanding, Ending Balance	3,771,093
Number of Shares, Exercisable at September 30, 2013	3,146,996
Number of Shares, Vested at September 30, 2013	1,883,245
Number of Shares, Vested and expected to vest at September 30, 2013	3,611,003
Weighted Average Exercise Price, Outstanding, Beginning balance	$2.40
Weighted Average Exercise Price, Granted	$17.68
Weighted Average Exercise Price, Exercised	$0.30
Weighted Average Exercise Price, Forfeited	$10.64
Weighted Average Exercise Price, Canceled	$0.99
Weighted Average Exercise Price, Outstanding, Ending balance	$7.89
Weighted Average Exercise Price, Exercisable at September 30, 2013	$7.21
Weighted Average Exercise Price, Vested at September 30, 2013	$1.34
Weighted Average Exercise Price, Vested and expected to vest at September 30, 2013	$7.54
Weighted Average Remaining Contractual Life, Outstanding at September 30, 2013	'7 years
Weighted Average Remaining Contractual Life, Exercisable at September 30, 2013	'6 years 7 months 10 days
Weighted Average Remaining Contractual Life, Vested at September 30, 2013	'4 years 8 months 27 days
Weighted Average Remaining Contractual Life, Vested and expected to vest at September 30, 2013	'6 years 10 months 21 days
Aggregate Intrinsic Value, Outstanding at September 30, 2013	$28,412
Aggregate Intrinsic Value, Exercisable at September 30, 2013	25,571
Aggregate Intrinsic Value, Vested at September 30, 2013	24,225
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2013	$28,202

ShareBased_Compensation_Schedu

Share-Based Compensation - Schedule of Recognized Share-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Expenses	'	'	'	'
Share-based compensation expense	'	'	$2,462	$682
Share Options [Member] \| Cost of Net Revenue [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	15	5	30	15
Share Options [Member] \| Research and Development [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	316	137	715	347
Share Options [Member] \| Sales, General and Administrative [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	552	151	1,213	320
Restricted Share Awards [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	'	'	504	'
Restricted Share Awards [Member] \| Cost of Net Revenue [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	19	'	32	'
Restricted Share Awards [Member] \| Research and Development [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	230	'	409	'
Restricted Share Awards [Member] \| Sales, General and Administrative [Member]	'	'	'	'
Operating Expenses	'	'	'	'
Share-based compensation expense	$36	'	$63	'

ShareBased_Compensation_Summar1

Share-Based Compensation - Summary of Information about Share Options Outstanding (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Share Options Outstanding, Share Outstanding	3,771,093	2,734,688
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	'7 years	'
Share Options Outstanding, Weighted Average Exercise Price	$7.89	$2.40
Share Options Exercisable, Shares Exercisable	3,146,996	'
Share Options Exercisable, Weighted Average Exercise Price	$7.21	'
$0.13 - $0.25 [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Share Options Outstanding, Share Outstanding	789,600	'
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	'2 years 9 months	'
Share Options Outstanding, Weighted Average Exercise Price	$0.13	'
Share Options Exercisable, Shares Exercisable	789,600	'
Share Options Exercisable, Weighted Average Exercise Price	$0.13	'
Range of Exercise Prices	$0.13	'
Range of Exercise Prices	$0.25	'
$0.40 - $1.03 [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Share Options Outstanding, Share Outstanding	758,480	'
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	'5 years 2 months 27 days	'
Share Options Outstanding, Weighted Average Exercise Price	$0.96	'
Share Options Exercisable, Shares Exercisable	735,166	'
Share Options Exercisable, Weighted Average Exercise Price	$0.96	'
Range of Exercise Prices	$0.40	'
Range of Exercise Prices	$1.03	'
$2.20 - $9.43 [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Share Options Outstanding, Share Outstanding	897,253	'
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	'8 years 5 months 9 days	'
Share Options Outstanding, Weighted Average Exercise Price	$6.11	'
Share Options Exercisable, Shares Exercisable	581,830	'
Share Options Exercisable, Weighted Average Exercise Price	$6.08	'
Range of Exercise Prices	$2.20	'
Range of Exercise Prices	$9.43	'
$16.03 - $17.85 [Member]	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'
Share Options Outstanding, Share Outstanding	1,325,760	'
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	'9 years 6 months 22 days	'
Share Options Outstanding, Weighted Average Exercise Price	$17.68	'
Share Options Exercisable, Shares Exercisable	1,040,400	'
Share Options Exercisable, Weighted Average Exercise Price	$17.64	'
Range of Exercise Prices	$16.03	'
Range of Exercise Prices	$17.85	'

ShareBased_Compensation_Summar2

Share-Based Compensation - Summary of Details Related to RSAs, Granted and Outstanding (Detail) (Restricted Share Awards [Member], USD $)	0 Months Ended	9 Months Ended
	Apr. 23, 2013	Sep. 30, 2013
Restricted Share Awards [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance	'	'
Weighted-Average Grant Date Fair Value Per Share, Granted	'	$17.98
Weighted-Average Grant Date Fair Value Per Share, Vested	'	'
Weighted-Average Grant Date Fair Value Per Share, Forfeited	'	$17.98
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance	'	$17.98
Number of Shares, Outstanding, Beginning balance	'	'
Number of Shares, Granted	317,120	330,620
Number of Shares, Vested	'	'
Number of Shares, Forfeited	'	8,200
Number of Shares, Outstanding, Ending balance	'	322,420

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Provision for income tax	$737,000	$427,000	$1,709,000	$980,000
Effective tax rate	8.40%	6.30%	9.20%	6.30%
Unrecognized tax benefits that would affect the effective tax rate	$6,900,000	'	$6,900,000	'

Segment_and_Geographic_Informa2

Segment and Geographic Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
	Segment
Segment Reporting [Abstract]	'
Number of operating segment	1

Segment_and_Geographic_Informa3

Segment and Geographic Information - Summary of Company's Revenue by Geographic Region (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue, Major Customer [Line Items]	'	'	'	'
Revenue	$30,056	$20,601	$75,448	$54,538
Hong Kong [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenue	27,618	18,421	68,404	50,002
Asia Pacific [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenue	960	912	2,782	1,236
United States [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenue	785	1,008	2,655	2,644
Europe [Member]	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'
Revenue	$693	$260	$1,607	$656

Segment_and_Geographic_Informa4

Segment and Geographic Information - Summary of Company's Revenue Generated from Sales of Semiconductors Solutions (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	$30,056	$20,601	$75,448	$54,538
Home Entertainment [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	27,255	18,649	68,371	50,614
Cloud Computing Market [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	$2,801	$1,952	$7,077	$3,924

Commitments_and_Contingencies_1

Commitments and Contingencies - Summary of Future Minimum Lease Payment under Noncancelable Operating Leases (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Total contractual obligations	$4,131
Total contractual obligations, Less than 1 Year	1,985
Total contractual obligations, 1 - 3 Years	1,877
Total contractual obligations, 3 - 5 Years	269
Purchase obligations, Total	1,670
Purchase obligations, Less than 1 Year	1,670
Operating lease obligations, Total	2,461
Operating lease obligations, Less than 1 Year	315
Operating lease obligations, 1 - 3 Years	1,877
Operating lease obligations, 3 - 5 Years	$269

Commitments_and_Contingencies_2

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments And Contingencies Disclosure [Abstract]	'	'	'	'
Rent expense under operating leases	$352	$234	$917	$517

25for1_Reverse_Share_Split_Add

2.5-for-1 Reverse Share Split - Additional Information (Detail) (USD $)	0 Months Ended
	Sep. 06, 2013	Sep. 30, 2013	Dec. 31, 2012
Class of Stock [Line Items]	'	'	'
Reverse share split	'2.5-for-1	'	'
Ordinary shares, par value	$0.01	$0.01	$0.01
Preferred shares, par value	$0.01	'	'
Before Reverse Share Split [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Ordinary shares, par value	$0.01	'	'
Preferred shares, par value	$0.01	'	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (Subsequent Events [Member])	0 Months Ended
	Oct. 02, 2013
Subsequent Events [Member]	'
Subsequent Event [Line Items]	'
Public offering shares	8,165,000
Ordinary shares issued upon conversion of Convertible Preferred Shares	16,163,598

Pro_Forma_Balance_Sheet_and_Ne2

Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Earnings Per Share Pro Forma [Line Items]	'
Conversion of preferred shares	'Conversion ratio of 1 for 1 (Series A, Series B issue on December 20, 2007 and Series B-2), 1 for 1.0173 (Series B issued on June 19, 2006) and 1 for 1.040 (Series B-1).
Convertible Preferred Shares [Member]	'
Earnings Per Share Pro Forma [Line Items]	'
Carrying value of the convertible preferred shares	54,400

Pro_Forma_Balance_Sheet_and_Ne3

Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:	'	'	'	'
Actual net income attributable to ordinary shareholders	$1,581	$1,157	$3,139	$2,514
Pro-forma effect of preferred shares	6,460	'	13,674	'
Net income	$8,041	$6,365	$16,813	$14,594
Actual weighted average number of ordinary shares outstanding	'	'	'	'
Basic	4,658,034	4,321,144	4,618,302	4,303,135
Diluted	6,527,371	6,391,252	6,557,368	6,295,066
Pro-forma effect of preferred shares	16,163,598	'	16,163,598	'
Denominator for pro-forma basic and diluted calculation	'	'	'	'
Basic	20,821,632	'	20,781,900	'
Diluted	22,690,969	'	22,720,966	'
Pro-forma basic and diluted net income per share attributable to ordinary shareholders	'	'	'	'
Basic	$0.39	'	$0.81	'
Diluted	$0.35	'	$0.74	'

Restricted_Net_Assets_Addition

Restricted Net Assets - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
	Sep. 30, 2013	PRC [Member]	PRC [Member]
Restricted Net Assets [Line Items]	'	'	'
Percentage of profit after-tax kept into general reserves, Minimum	10.00%	'	'
Percentage of profit after-tax kept into general reserves to reach cumulative amount of paid-in capital	50.00%	'	'
Approximate amount of restricted portion of net assets	'	$10,749	$10,749