Organization and Significant Accounting Policies (Tables)

6 Months Ended

Jun. 28, 2013

Accounting Policies [Abstract]

Customers as percentage of total sales

Sales to each of these customers as a percentage of total sales were as follows:

	Six months ended
	June 28, 2013			June 29, 2012
Applied Materials, Inc.		33.2	%		44.5	%
Lam Research Corporation (1)		31.0	%		37.7	%
ASM International (2)		14.8	%		—
Total		79.1	%		82.2	%

(1) In June 2012, Lam Research Corporation completed the acquisition of Novellus Systems, Inc., one of the Company’s customers. The sales percentages for Lam Research Corporation for the six months ended June 29, 2012, have been updated to reflect the inclusion of sales to Novellus Systems, Inc., for comparison purposes.

(2) Sales to ASM International are the result of the Company’s acquisition of AIT during the third quarter of 2012, and, therefore, there were no sales to ASM International during the same period of the prior year.

Components of the reserve for warranty costs

Components of the reserve for warranty costs consisted of the following (in thousands):

	Six months ended
	June 28, 2013			June 29, 2012
Beginning balance	$	152		$	350
Change in reserve		30			58
Warranty claims		(77	)		(83	)
Ending balance	$	105		$	325

Summary of information with respect to options granted, exercised and canceled

The following table summarizes information with respect to options granted, exercised and canceled in the six months ended June 28, 2013 and outstanding at June 28, 2013:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at December 28, 2012		1,514,113		$	6.98		4.0	$	1,444,653
Granted		—			—
Exercised		(66,243	)	$	1.19
Canceled		(8,673	)	$	8.74
Outstanding at June 28, 2013		1,439,197		$	7.23		3.4	$	1,793,435
Vested and expected to vest at June 28, 2013		1,439,146		$	7.23		3.4	$	1,793,378
Vested and exercisable at June 28, 2013		1,434,216		$	7.24		3.4	$	1,784,377

Restricted stock unit and restricted stock award activity

The following table summarizes the Company’s restricted stock unit and restricted stock award activity for the six months June 28, 2013:

	Number of Shares
Unvested restricted stock units and restricted stock awards at December 28, 2012		1,312,706
Granted		631,200
Vested		(527,705	)
Forfeited		(154,717	)
Unvested restricted stock units and restricted stock awards at June 28, 2013		1,261,484

Stock-based compensation expense included in condensed consolidated statements of operations

The following table shows the Company’s stock-based compensation expense included in the condensed consolidated statements of operations (in thousands):

	Three months ended						Six months ended
	June 28, 2013			June 29, 2012			June 28, 2013			June 29, 2012
Cost of sales(1)	$	308		$	422		$	725		$	815
Research and development		59			86			147			165
Sales and marketing		96			112			228			206
General and administrative		537			777			1,220			1,463
Total stock-based compensation expense		1,000			1,397			2,320			2,649
Income tax benefit		(201	)		(279	)		(504	)		(585	)
Total stock-based compensation expense, net of income tax benefit	$	799		$	1,118		$	1,816		$	2,064

(1) As of June 28, 2013 and June 29, 2012, there were no stock-based compensation expenses capitalized in inventory.