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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Stock-Based Compensation Expense

The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income:

		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
Cost of product revenue		$	24,059			$	10,646			$	47,151			$	33,420
Research and development			30,092				53,094				73,814				169,919
Selling, general and administrative			151,621				224,539				647,569				540,609
Total		$	205,772			$	288,279			$	768,534			$	743,948

Summary of Option Activity

Information regarding option activity for the nine months ended September 30, 2013 under the Plans is summarized below:

		Options Outstanding				Weighted- Average Exercise Price Per Share				Weighted- Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value
Options outstanding at January 1, 2013			2,315,090			$	4.20
Granted			541,052				6.97
Exercised			(884,954	)			4.36
Forfeited/Cancelled			(300,500	)			5.03
Options outstanding at September 30, 2013			1,670,688			$	4.87				6.91			$	10,394,325
Options exercisable at September 30, 2013			866,136			$	4.19				5.16			$	5,972,968
Vested and expected to vest at September 30, 2013 (1)			1,576,516			$	4.77				6.82			$	9,970,772

(1) This represents the number of vested options as of September 30, 2013 plus the number of unvested options expected to vest as of September 30, 2013 based on the unvested outstanding options at September 30, 2013 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

X

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

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-Publisher SEC

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X

- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

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