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Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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Fair Value Measurement (Details 1) (USD $) In Thousands, unless otherwise specified				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jan. 01, 2011	Jun. 30, 2012 RetinaLabs Acquisition [Member]	Dec. 31, 2011 RetinaLabs Acquisition [Member]	Jun. 30, 2012 Ocunetics, Inc. Acquisition [Member]	Dec. 31, 2011 Ocunetics, Inc. Acquisition [Member]
Reconciliation of the beginning and ending balances of the earn-out - cash
Balance at the beginning of the period	$ 681	$ 765	$ 380
Addition of earn-out - cash related to Ocunetics, Inc. acquisition						0	105
Payment made on earn-out - RetinaLabs				(162)	0
Change in fair value of contingent consideration				78	280
Balance at the end of the period	$ 681	$ 765	$ 380