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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Stock-Based Compensation Expense

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

		Three months ended June 30,								Six months ended June 30,
		2017				2016				2017				2016
Cost of product revenue		$	153			$	84			$	294			$	144
Research and development			79				105				211				185
Selling, general and administrative			1,264				948				2,522				1,730
Total		$	1,496			$	1,137			$	3,027			$	2,059

Summary of Option Activity

Information regarding option activity for the six-month period ended June 30, 2017 under the Plans is summarized below:

		Options Outstanding				Weighted- Average Exercise Price Per Share				Weighted- Average Remaining Contractual Term (in years)				(in thousands) Aggregate Intrinsic Value
Options outstanding at December 31, 2016			882,748			$	16.88
Granted			101,844				33.38
Exercised			(149,903	)			10.04
Forfeited/cancelled			(31,157	)			20.27
Options outstanding at June 30, 2017			803,532			$	20.16				6.90			$	17,145
Options exercisable at June 30, 2017			439,980			$	14.98				5.71			$	11,695
Vested and expected to vest at June 30, 2017 (1)			790,545			$	20.04				6.87			$	16,921

⁽¹⁾  Represents the number of vested options as of June 30, 2017 plus the number of unvested options expected to vest as of June 30, 2017 based on the unvested outstanding options at June 30, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

Summary of Restricted Stock Unit Activity

Information regarding restricted stock unit activity for the three months ended June 30, 2017 under the Plans is summarized below:

		Options Outstanding				Weighted- Average Exercise Price Per Share				Weighted- Average Remaining Contractual Term (in years)				(in thousands) Aggregate Intrinsic Value
Restricted stock units outstanding at December 31, 2016			353,838			$	—
Granted			146,154				—
Exercised			(94,261	)			—
Forfeited/cancelled			(12,393	)			—
Restricted stock units outstanding at June 30, 2017			393,338			$	—				2.93			$	16,300
Vested and expected to vest at June 30, 2017 (1)			362,788			$	—				2.82			$	15,034

⁽¹⁾  Represents the number of vested restricted stock units as of June 30, 2017 plus the number of unvested restricted stock units expected to vest as of June 30, 2017 based on the unvested outstanding restricted stock units at June 30, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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- 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 FASB
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- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

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