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

12 Months Ended

Dec. 31, 2018

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 loss per share (in thousands, except per share data):

	Years Ended December 31,
	2018			2017
Numerator:
Loss from continuing operations, net of income taxes	$	(44,442	)	$	(53,862	)
Income from discontinued operations, net of income taxes	7,894			10,733
Net loss	$	(36,548	)	$	(43,129	)
Denominator:
Weighted average common shares outstanding, basic and diluted	41,031			35,480
Net income (loss) per share - basic and diluted:
Continuing operations	$	(1.08	)	$	(1.52	)
Discontinued operations	0.19			0.30
Net loss per share - basic and diluted	$	(0.89	)	$	(1.22	)

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 computation of diluted earnings per share because they are anti-dilutive for continuing operations, and as such the treatment for discontinued operations is also anti-dilutive (in thousands of shares):

	2018	2017
Outstanding options to purchase common stock	357	361
Unvested restricted stock awards	—	26
Unvested restricted stock unit awards	2,757	2,650
Employee stock purchase plan awards	122	38
Bonus and director fees to be paid in stock awards	734	477
Convertible senior notes	7,245	7,245
	11,215	10,797

Revenues by product line and geographic area

Revenue by geographic area is presented below (in thousands):

	Years ended December 31,
Revenue from external customers located in(1):	2018		2017
China	$	28,790	$	36,251
United States	15,733		7,989
Germany	12,201		11,641
Hungary	12,169		13,451
All other countries (2)	21,566		18,377
Total	$	90,459	$	87,709
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⁽¹⁾    Location is determined by shipment destination.

⁽²⁾    Revenue from external customers located in countries included in “All other countries” does not individually comprise more than 10% of total revenue 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,
	2018		2017
United States	$	15,003	$	14,455
China	2,931		1,107
South Korea	6,443		4,398
Total	$	24,377	$	19,960