Restatement and Revisions on the Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 51,404	[1]	$ 36,940	[2]
Short-term investments	48,356	[1]	64,301	[2]
Restricted cash	2,108	[1]	2,626	[2]
Accounts receivable, net of allowance for doubtful accounts	63,267	[1]	70,354	[2]
Inventories	61,859	[1]	43,793	[2]
Prepaid expenses and other current assets	10,480	[1]	7,630	[2]
Total current assets	237,474	[1]	225,644	[2]
Long-term investments	331	[1]	188	[2]
Property, plant and equipment, net	70,001	[1]	54,440	[2]
Other intangible assets, net	18,766	[1]	14,213	[2]
Other long-term assets	1,361	[1]	1,147	[2]
Total assets	327,933	[1]	295,632	[2]
Current liabilities:
Accounts payable	40,817	[1]	36,308	[2]
Notes payable	10,431	[1]	12,003	[2]
Current portion of long-term debt	8,960	[1]	5,000	[2]
Accrued and other current liabilities	24,874	[1]	19,959	[2]
Total current liabilities	85,082	[1]	73,270	[2]
Long-term debt, net of current portion	42,170	[1]	17,167	[2]
Deferred income tax liabilities	655	[1]	653	[2]
Other noncurrent liabilities	8,147	[1]	1,862	[2]
Total liabilities	136,054	[1]	92,952	[2]
Preferred stock, $0.0025 par value At March 31,2013 and At December 31, 2012: 10,000,000 shares authorized, no shares issued or outstanding:		[1]		[2]
Common stock, $0.0025 par value At March 31, 2013: 100,000,000 shares authorized, 30,604,293 shares issued and outstanding; At December 31, 2012: 100,000,000 shares authorized, 30,546,155 shares issued and outstanding	76	[1]	76	[2]
Additional paid-in capital	440,144	[1]	438,858	[2]
Accumulated other comprehensive income	11,982	[1]	11,829	[2]
Accumulated deficit	(260,323)	[1]	(248,083)	[2]
Total stockholders’ equity	191,879	[1]	202,680	[2]
Total liabilities, redeemable common stock and stockholders’ equity	327,933	[1]	295,632	[2]
Previously Reported
Current assets:
Cash and cash equivalents	51,404
Short-term investments	48,356
Restricted cash	2,108
Accounts receivable, net of allowance for doubtful accounts	63,267
Inventories	68,818
Prepaid expenses and other current assets	8,053
Total current assets	242,006
Long-term investments	331
Property, plant and equipment, net	65,079
Goodwill	2,188
Other intangible assets, net	17,176
Other long-term assets	4,206
Total assets	330,986
Current liabilities:
Accounts payable	40,963
Notes payable	10,431
Current portion of long-term debt	10,710
Accrued and other current liabilities	23,520
Total current liabilities	85,624
Long-term debt, net of current portion	40,420
Deferred income tax liabilities	655
Other noncurrent liabilities	10,506		1,724
Total liabilities	137,205
Redeemable common stock	5,000		5,000
Preferred stock, $0.0025 par value At March 31,2013 and At December 31, 2012: 10,000,000 shares authorized, no shares issued or outstanding:
Common stock, $0.0025 par value At March 31, 2013: 100,000,000 shares authorized, 30,604,293 shares issued and outstanding; At December 31, 2012: 100,000,000 shares authorized, 30,546,155 shares issued and outstanding	76
Additional paid-in capital	435,282		433,996
Accumulated other comprehensive income	11,970
Accumulated deficit	(258,547)
Total stockholders’ equity	188,781
Total liabilities, redeemable common stock and stockholders’ equity	330,986
Corrections
Current assets:
Inventories	(212)
Prepaid expenses and other current assets	74
Total current assets	(138)
Property, plant and equipment, net	2,156
Goodwill	(2,188)
Other intangible assets, net	(72)
Other long-term assets	(2,064)
Total assets	(2,306)
Current liabilities:
Accounts payable	(146)
Current portion of long-term debt	(1,750)
Accrued and other current liabilities	1,225
Total current liabilities	(671)
Long-term debt, net of current portion	1,750
Other noncurrent liabilities	(2,400)
Total liabilities	(1,321)
Redeemable common stock	0
Preferred stock, $0.0025 par value At March 31,2013 and At December 31, 2012: 10,000,000 shares authorized, no shares issued or outstanding:
Accumulated other comprehensive income	12
Accumulated deficit	(997)
Total stockholders’ equity	(985)
Total liabilities, redeemable common stock and stockholders’ equity	(2,306)
Penalty Payment Derivative
Current liabilities:
Other noncurrent liabilities	138		138
Total liabilities	138
Redeemable common stock	(5,000)
Preferred stock, $0.0025 par value At March 31,2013 and At December 31, 2012: 10,000,000 shares authorized, no shares issued or outstanding:
Additional paid-in capital	4,862		4,862
Total stockholders’ equity	4,862
Revision for Measurement Period Adjustments
Current assets:
Inventories	(6,747)
Prepaid expenses and other current assets	2,353
Total current assets	(4,394)
Property, plant and equipment, net	2,766
Other intangible assets, net	1,662
Other long-term assets	(781)
Total assets	(747)
Current liabilities:
Accrued and other current liabilities	129
Total current liabilities	129
Other noncurrent liabilities	(97)
Total liabilities	32
Redeemable common stock	0
Preferred stock, $0.0025 par value At March 31,2013 and At December 31, 2012: 10,000,000 shares authorized, no shares issued or outstanding:
Accumulated deficit	(779)
Total stockholders’ equity	(779)
Total liabilities, redeemable common stock and stockholders’ equity	(747)
Restated and Revised
Current assets:
Cash and cash equivalents	51,404
Short-term investments	48,356
Restricted cash	2,108
Accounts receivable, net of allowance for doubtful accounts	63,267
Inventories	61,859
Prepaid expenses and other current assets	10,480
Total current assets	237,474
Long-term investments	331
Property, plant and equipment, net	70,001
Other intangible assets, net	18,766
Other long-term assets	1,361
Total assets	327,933
Current liabilities:
Accounts payable	40,817
Notes payable	10,431
Current portion of long-term debt	8,960
Accrued and other current liabilities	24,874
Total current liabilities	85,082
Long-term debt, net of current portion	42,170
Deferred income tax liabilities	655
Other noncurrent liabilities	8,147
Total liabilities	136,054
Redeemable common stock	0
Preferred stock, $0.0025 par value At March 31,2013 and At December 31, 2012: 10,000,000 shares authorized, no shares issued or outstanding:
Common stock, $0.0025 par value At March 31, 2013: 100,000,000 shares authorized, 30,604,293 shares issued and outstanding; At December 31, 2012: 100,000,000 shares authorized, 30,546,155 shares issued and outstanding	76
Additional paid-in capital	440,144
Accumulated other comprehensive income	11,982
Accumulated deficit	(260,323)
Total stockholders’ equity	191,879
Total liabilities, redeemable common stock and stockholders’ equity	$ 327,933

[1] Restated and Revised, see Notes 2 and 7

[2] Revised, see Note 2