Debt - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended			3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended													12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012		Dec. 31, 2007	Mar. 31, 2013 Term Loan	Dec. 31, 2012 Equipment	Dec. 31, 2012 Capital expenditure, authorized Equipment	Mar. 31, 2013 Libor Plus Rate	Dec. 31, 2012 Libor Plus Rate	Mar. 31, 2013 Libor Plus Rate Term Loan	Dec. 31, 2012 Libor Plus Rate Equipment	Mar. 31, 2013 Base Rate Term Loan	Mar. 31, 2013 Credit Facility	Dec. 31, 2012 Credit Facility	Mar. 31, 2013 Credit Facility Libor Plus Rate	Dec. 31, 2012 Credit Facility Libor Plus Rate	Dec. 31, 2012 Credit Facility Libor Plus Rate Equipment	Mar. 31, 2013 Credit Facility Base Rate	Mar. 29, 2013 Optical Components Business Units	Mar. 29, 2013 Optical Components Business Units Current portion of long-term debt	Mar. 29, 2013 Optical Components Business Units Total long-term debt, net of current portion	Mar. 31, 2013 Optical Components Business Units To be paid in three equal installments Notes Payable	Mar. 29, 2013 Optical Components Business Units To be paid in three equal installments Notes Payable	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Capital expenditure, authorized	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Libor Plus Rate	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Credit Facility Libor Plus Rate
Debt Instrument [Line Items]
Liabilities assumed																					$ 3,700,000	$ 7,400,000	$ 11,130,000	$ 11,130,000
Obligation bear interest																				1.50%
Revolving line of credit, maximum borrowing capacity														12,000,000	8,000,000
Line of credit facility remaining borrowing capacity								7,000,000						8,000,000	0											5,800,000
Interest rate description									Borrowings under this revolving line of credit include an interest rate option of a base rate as defined in the agreement plus 1.5% or LIBOR plus 2.5%.	Borrowings under this facility bear interest at a rate of LIBOR plus 2%.	Borrowings under the term loan include an interest rate option of a base rate as defined in the agreement plus 1.75% or LIBOR plus 2.75%	Borrowings under this facility would bear interest at a rate of LIBOR plus 2%.															The advances bear interest at a rate of LIBOR plus 2%.
Line of credit facility, rate											2.75%		1.75%			2.50%	2.00%	2.00%	1.50%									2.00%
Credit facility outstanding balance						28,000,000	0																		14,200,000
Line of credit facility, expiration date						2017-06								2016-03
Debt Instrument, Covenant Compliance	The Company’s U.S. loan and security agreement requires it to maintain specified financial covenants, including a liquidity ratio, restricts its ability to incur additional debt or to engage in specified transactions and is secured by substantially all of its U.S. assets, other than intellectual property assets. As of March 31, 2013 and December 31, 2012, the Company was in compliance with the covenants contained in this agreement		The Company’s U.S. loan and security agreement requires it to maintain specified financial covenants, including a liquidity ratio, restricts its ability to incur additional debt or to engage in specified transactions and is secured by substantially all of its U.S. assets, other than intellectual property assets. As of March 31, 2013 and December 31, 2012, the Company was in compliance with the covenants contained in this agreement
Warrant issued					4,482
Exercise price of warrant					29.00
Restricted cash	$ 2,108,000	[1]	$ 2,626,000	[2]

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

[2] Revised, see Note 2