SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Statement of Cash Flow Information

The following non-cash activities occurred (in thousands):

	Year Ended December 31,
	2013			2012			2011
Unrealized (loss) gain on available-for-sale securities	$	(10	)	$	(31	)	$	(1	)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period	315			328			300
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes	282			252			1,113
Fair value of stock warrant liability reclassified to shareholders’ equity upon exercise	—			—			14,850
Property and equipment purchases included in accounts payable	420			165			—

Short-term investments

Investments at December 31, 2013 and 2012 consist of the following (in thousands):

	Amortized		Unrealized					Aggregate Fair
Investment Classification	Cost		Gains		(Losses)			Market Value
December 31, 2013
Certificates of deposit	$	11,358	$	2	$	(16	)	$	11,344
Corporate bonds	190,738		33		(48		)	190,723
U.S. Government bonds	3,074		—		—			3,074
Convertible notes	4,300		—		—			4,300
	$	209,470	$	35	$	(64	)	$	209,441
December 31, 2012
Certificates of deposit	$	7,562	$	3	$	(5	)	$	7,560
Commercial paper	2,997		—		—			2,997
Corporate bonds	141,349		9		(25		)	141,333
U.S. Government bonds	3,098		—		—			3,098
Convertible notes	4,300		—		—			4,300
	$	159,306	$	12	$	(30	)	$	159,288

Assets and liabilities carried at fair value measured on a recurring basis

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2013 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of December 31, 2013		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	7,600	$	7,600	$	—	$	—
Short-term investments	202,024		202,024		—		—
Long-term investments	7,417		3,117		—		4,300

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2012 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of December 31, 2012		Quoted prices in active markets  (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	63,863	$	63,863	$	—	$	—
Short-term investments	158,018		154,018		—		4,000
Long-term investments	1,270		970		—		300

Reconciliation of the changes in fair value of the Company's investments in convertible notes

The following table is a reconciliation of the changes in fair value of the Company’s investments in convertible notes for the years ended December 31, 2013 and 2012, which had been classified in Level 3 in the fair value hierarchy (in thousands):

	Year Ended December 31,
	2013		2012
Fair value of notes, beginning of year	$	4,300	$	—
Investments	—		4,300
Fair value of notes, end of year	$	4,300	$	4,300

Reconciliation of the changes in fair value of the Company's stock warrant liability

The following table is a reconciliation of the changes in fair value of the Company’s stock warrant liability for the year ended December 31, 2011, which had been classified in Level 3 in the fair value hierarchy (in thousands):

	Year Ended December 31, 2011
Fair value of stock warrant liability, beginning of year	$	10,660
Loss for period	4,190
Warrants exercised	(14,850		)
Fair value of stock warrant liability, end of year	$	—

Basic and diluted net income (loss) per common share

The following table is a reconciliation of net income and the shares used in calculating basic and diluted net income per common share for the years ended December 31, 2013, 2012 and 2011 (in thousands, except share and per share data):

	Year Ended December 31,
	2013		2012		2011
Numerator:
Net income	$	74,052	$	9,660	$	3,155
Denominator:
Weighted average common shares outstanding – Basic	45,898,019		45,951,276		43,737,968
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	458,574		648,661		956,803
Restricted stock awards and units and performance units	187,012		283,665		445,623
Weighted average common shares outstanding – Diluted	46,543,605		46,883,602		45,140,394
Net income per common share:
Basic	$	1.61	$	0.21	$	0.07
Diluted	$	1.59	$	0.21	$	0.07

Research and development expenses

Research and development expenses consist of the following (in thousands):

	Year Ended December 31,
	2013		2012		2011
Development and operations in the Company’s facilities	$	23,491	$	21,381	$	18,707
Costs incurred under sponsored research agreements	2,671		2,058		1,022
PPG OLED Materials Agreement (Note 7)	7,470		6,170		3,539
Scientific Advisory Board compensation	583		423		861
	$	34,215	$	30,032	$	24,129

Non-cash activities

The following non-cash activities occurred (in thousands):

	Year Ended December 31,
	2013			2012			2011
Unrealized (loss) gain on available-for-sale securities	$	(10	)	$	(31	)	$	(1	)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period	315			328			300
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes	282			252			1,113
Fair value of stock warrant liability reclassified to shareholders’ equity upon exercise	—			—			14,850
Property and equipment purchases included in accounts payable	420			165			—