Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of computation of basic and diluted net income (loss) per share

The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share data):

	Years Ended December 31,
			2011
	2012		(Restated)			2010
Numerator
Net income (loss)	$	7,174	$	(1,438	)	$	(6,056	)
Denominator
Weighted average common shares outstanding	28,568		27,637			26,234
Effect of potentially dilutive securities
Options to purchase common stock	115		—			—
Convertible debentures	—		—			—
Restricted stock awards	10		—			—
Restricted stock unit awards	2		—			—
Employee stock purchase plan	14		—			—
Weighted average common shares outstanding, assuming dilution	28,709		27,637			26,234
Net income (loss) per share
Basic	$	0.25	$	(0.05	)	$	(0.23	)
Diluted	$	0.25	$	(0.05	)	$	(0.23	)

Schedule of instruments convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be anti-dilutive

The following table summarizes instruments that may be convertible into common shares that are not included in the denominator used in the diluted net income (loss) per share calculation because to do so would be antidilutive (in thousands):

Common Stock	2012	2011	2010
Outstanding options to purchase common stock	504	1,184	1,515
Restricted stock awards outstanding	319	262	96
Shares issuable on conversion of convertible debentures	—	—	514
Restricted stock unit awards	20	22	14
Employee stock purchase plan awards	—	21	16

Revenues by product line and geographic area

Revenues by product line and geographic area are presented below (in thousands):

	Year ending December 31,
			2011
	2012		(Restated)		2010
Revenues by product line:
Ultracapacitors	$	95,953	$	86,836	$	68,501
High-voltage capacitors	45,574		42,309		35,708
Microelectronic products	17,731		18,031		17,673
Total	$	159,258	$	147,176	$	121,882
	Year ending December 31,
			2011
	2012		(Restated)		2010
Revenues from external customers located in:
China	$	74,054	$	43,187	$	30,835
United States	26,473		29,723		22,248
Germany	25,119		26,253		27,579
All other countries (1)	33,612		48,013		41,220
Total	$	159,258	$	147,176	$	121,882

 _____________

(1) Revenue from external customers located in countries included in “All other countries” do not individually compromise more than 10% of total revenues for any of the years presented.

Long-lived assets by geographic location

Long-lived assets by geographic location are as follows (in thousands):

	December 31,
	2012		2011		2010
Long-lived assets:
United States	$	24,239	$	17,614	$	10,865
China	6,340		5,916		4,786
Switzerland	5,862		5,211		5,259
Total	$	36,441	$	28,741	$	20,910