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

12 Months Ended

Dec. 31, 2015

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,
	2015			2014			2013
Numerator
Net income (loss)	$	(22,333	)	$	(6,272	)	$	6,340
Denominator
Weighted average common shares outstanding	30,716			29,216			28,869
Effect of potentially dilutive securities
Options to purchase common stock	—			—			16
Restricted stock awards	—			—			3
Restricted stock unit awards	—			—			14
Employee stock purchase plan	—			—			1
Weighted average common shares outstanding, assuming dilution	30,716			29,216			28,903
Net income (loss) per share
Basic	$	(0.73	)	$	(0.21	)	$	0.22
Diluted	$	(0.73	)	$	(0.21	)	$	0.22

Schedule of anti-dilutive shares

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 anti-dilutive (in thousands):

Common Stock	2015	2014	2013
Outstanding options to purchase common stock	931	672	790
Unvested restricted stock awards	245	528	424
Unvested restricted stock unit awards	885	224	—
Employee stock purchase plan awards	10	9	1

Revenues by product line and geographic area

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

	Years ended December 31,
	2015		2014		2013
Revenues by product line:
Ultracapacitors	$	114,525	$	135,637	$	136,277
High-voltage capacitors	41,718		40,361		43,339
Microelectronic products	11,129		10,588		13,918
Total	$	167,372	$	186,586	$	193,534
	Years ended December 31,
	2015		2014		2013
Revenues from external customers located in:
China	$	87,856	$	89,143	$	92,817
United States	20,836		23,758		29,090
Germany	13,972		16,384		25,935
All other countries (1)	44,708		57,301		45,692
Total	$	167,372	$	186,586	$	193,534

_____________

(1) Revenue from external customers located in countries included in “All other countries” do not individually comprise 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):

	As of December 31,
	2015		2014		2013
Long-lived assets:
United States	$	22,267	$	28,013	$	33,740
China	4,148		4,991		5,444
Switzerland	6,021		5,663		6,422
Total	$	32,436	$	38,667	$	45,606