Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Accounts receivable, allowance for doutbful accounts	$ 0	[1]	$ 43	[1]
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	10,000,000		10,000,000
Preferred stock, shares issued	0		0
Preferred stock, shares outstanding	0		0
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001
Common stock, shares authorized	150,000,000		150,000,000
Common stock, shares issued	54,491,000		52,947,000
Common stock, shares outstanding	53,826,000		52,293,000
Treasury stock, shares	665,000		654,000

[1] Accounts receivable, net at June 30, 2013 relating to the Company's DigitalOptics operations in Charlotte, North Carolina and Zhuhai, China are included in discontinued operations. See Note 6 – "Discontinued Operations," for additional details.