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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Stock-Based Compensation Expense

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

		Three months ended June 30,								Six months ended June 30,
		2013				2012				2013				2012
Cost of product revenue		$	11,428			$	13,368			$	23,093			$	22,774
Research and development			36,081				64,489				43,721				116,825
Selling, general and administrative			265,182				136,940				495,948				316,070
Total		$	312,691			$	214,797			$	562,762			$	455,669

Summary of Option Activity

Information regarding option activity for the six months ended June 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			388,052				5.86
Exercised			(786,254	)			4.28
Forfeited/Cancelled			(121,300	)			4.28
Options outstanding at June 30, 2013			1,795,588			$	4.53				7.14			$	6,689,614
Options exercisable at June 30, 2013			865,636			$	4.31				5.36			$	3,405,885
Vested and expected to vest at June 30, 2013 (1)			1,694,909			$	4.48				7.07			$	6,388,888

(1) This represents the number of vested options as of June 30, 2013 plus the number of unvested options expected to vest as of June 30, 2013 based on the unvested outstanding options at June 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

-Name Staff Accounting Bulletin (SAB)

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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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