Restatement and Revisions Consolidated Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Cash Flows From Operating Activities
Net loss	$ (12,240)	[1],[2],[3]	$ (11,608)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,152	[3]	5,353
Asset impairment charges	34	[3]	14
Stock-based compensation expense	1,202	[3]	1,144
Deferred taxes			387
Loss on disposal of property and equipment	111	[3]	18
Gain on sale of discontinued operations			(750)
Allowance for doubtful accounts	22	[3]	8
Write-down of inventories	30	[3]	721
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	7,155	[3]	9,155
Inventories	(4,682)	[3]	(4,680)
Prepaid expenses and other assets	(977)	[3]	(1,800)
Accounts payable	2,126	[3]	584
Acquisition-related transaction costs	3,948	[3]
Accrued and other liabilities	280	[3]	(184)
Net cash provided by (used in) operating activities	1,161	[3]	(1,638)
Cash Flows From Investing Activities
Purchase of property, plant and equipment	(5,134)	[3]	(2,019)
Purchase of marketable securities	(29,030)	[3]	(12,964)
Proceeds from sale of marketable securities	23,747	[3]	5,139
Proceeds from maturity of securities	20,900	[3]	15,100
Decrease in restricted cash	524	[3]	68
Acquisition of OCU, net of notes payable	(14,087)	[3]
Net cash provided by (used in) investing activities	(3,080)	[3]	7,149
Cash flows from financing activities
Proceeds from bank loans	26,443	[3]
Repayment of bank loans	(8,610)	[3]	(1,250)
Proceeds from issuance of notes payable	4,881	[3]	7,738
Repayment of notes payable	(6,482)	[3]	(7,867)
Net cash provided by (used in) financing activities	16,311	[3]	(1,315)
Effect of exchange rates on cash and cash equivalents	72	[3]	209
Net increase in cash and cash equivalents	14,464	[3]	4,405
Cash and cash equivalents at the beginning of the period	36,940	[3]	32,485
Cash and cash equivalents at the end of the period	51,404	[3]	36,890
Previously Reported
Cash Flows From Operating Activities
Net loss	(10,464)	[4]
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,590	[4]
Asset impairment charges	34	[4]
Stock-based compensation expense	1,202	[4]
Deferred taxes	(781)	[4]
Amortization of premiums and discounts on investments		[4]
Loss on disposal of property and equipment	111	[4]
Gain on sale of discontinued operations		[4]
Allowance for doubtful accounts	22	[4]
Write-down of inventories	30	[4]
Others		[4]
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	7,155	[4]
Inventories	(4,682)	[4]
Prepaid expenses and other assets	(1,256)	[4]
Accounts payable	4,014	[4]
Acquisition-related transaction costs	3,190	[4]
Accrued and other liabilities	(1,462)	[4]
Net cash provided by (used in) operating activities	1,703	[4]
Cash Flows From Investing Activities
Purchase of property, plant and equipment	(5,134)	[4]
Purchase of marketable securities	(29,030)	[4]
Proceeds from sale of marketable securities	23,747	[4]
Proceeds from maturity of securities	20,900	[4]
Decrease in restricted cash	524	[4]
Acquisition of OCU, net of notes payable	(14,629)	[4]
Net cash provided by (used in) investing activities	(3,622)	[4]
Cash flows from financing activities
Proceeds from bank loans	40,000	[4]
Repayment of bank loans	(22,167)	[4]
Proceeds from issuance of notes payable	4,881	[4]
Repayment of notes payable	(6,482)	[4]
Net cash provided by (used in) financing activities	16,311	[4]
Effect of exchange rates on cash and cash equivalents	72	[4]
Net increase in cash and cash equivalents	14,464	[4]
Cash and cash equivalents at the beginning of the period	36,940	[4]
Cash and cash equivalents at the end of the period	51,404	[4]
Corrections
Cash Flows From Operating Activities
Net loss	(997)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	(438)
Amortization of premiums and discounts on investments
Gain on sale of discontinued operations
Others
Change in assets and liabilities, net of effects of acquisitions:
Prepaid expenses and other assets	281
Accounts payable	(1,888)
Acquisition-related transaction costs	758
Accrued and other liabilities	1,742
Net cash provided by (used in) operating activities	(542)
Cash Flows From Investing Activities
Acquisition of OCU, net of notes payable	542
Net cash provided by (used in) investing activities	542
Cash flows from financing activities
Proceeds from bank loans	(13,557)
Repayment of bank loans	13,557
Revision for Measurement Period Adjustments
Cash Flows From Operating Activities
Net loss	(779)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Deferred taxes	781
Amortization of premiums and discounts on investments
Gain on sale of discontinued operations
Others
Change in assets and liabilities, net of effects of acquisitions:
Prepaid expenses and other assets	(2)
Restated and Revised
Cash Flows From Operating Activities
Net loss	(12,240)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,152
Asset impairment charges	34
Stock-based compensation expense	1,202
Amortization of premiums and discounts on investments
Loss on disposal of property and equipment	111
Gain on sale of discontinued operations
Allowance for doubtful accounts	22
Write-down of inventories	30
Others
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	7,155
Inventories	(4,682)
Prepaid expenses and other assets	(977)
Accounts payable	2,126
Acquisition-related transaction costs	3,948
Accrued and other liabilities	280
Net cash provided by (used in) operating activities	1,161
Cash Flows From Investing Activities
Purchase of property, plant and equipment	(5,134)
Purchase of marketable securities	(29,030)
Proceeds from sale of marketable securities	23,747
Proceeds from maturity of securities	20,900
Decrease in restricted cash	524
Acquisition of OCU, net of notes payable	(14,087)
Net cash provided by (used in) investing activities	(3,080)
Cash flows from financing activities
Proceeds from bank loans	26,443
Repayment of bank loans	(8,610)
Proceeds from issuance of notes payable	4,881
Repayment of notes payable	(6,482)
Net cash provided by (used in) financing activities	16,311
Effect of exchange rates on cash and cash equivalents	72
Net increase in cash and cash equivalents	14,464
Cash and cash equivalents at the beginning of the period	36,940
Cash and cash equivalents at the end of the period	$ 51,404

[1] Restated and Revised, see Note 2

[2] Restated and Revised, see Note 2

[3] Restated and Revised, see Note 2

[4] The Company’s condensed consolidated statement of cash flows for the three months ended March 31, 2013 was previously restated for amounts related to purchases of property and equipment that were inadvertently overstated resulting in the overstatement of cash used in investing activities by $1.1 million and the overstatement of net cash provided by operating activities by the same amount.