CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Net sales	$ 21,936	$ 20,974	$ 42,286	$ 40,243
Cost of sales	6,462	6,348	12,235	12,624
Gross profit	15,474	14,626	30,051	27,619
General and administrative	4,761	4,928	10,120	13,393
Marketing and selling	7,321	7,181	13,851	14,856
Research and development	4,712	4,659	9,495	11,565
Total selling, general and administrative expenses	16,794	16,768	33,466	39,814
Operating loss	(1,320)	(2,142)	(3,415)	(12,195)
Other income (expense):
Interest expense, net	(32)	(29)	(61)	(57)
Gain (loss) on foreign currency transactions	380	(416)	294	42
Royalty income	128	351	259	373
Other income (expense), net	19	(38)	36	(82)
Other income (expense), net	495	(132)	528	276
Loss before provision (benefit) for income taxes	(825)	(2,274)	(2,887)	(11,919)
Provision (benefit) for income taxes	146	(131)	287	(1,735)
Net loss	$ (971)	$ (2,143)	$ (3,174)	$ (10,184)
Net loss per share - basic and diluted	$ (0.02)	$ (0.05)	$ (0.08)	$ (0.25)
Weighted average shares outstanding - basic and diluted	40,933	40,210	40,841	40,097

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

No definition available.