Stockholders' Equity (Details) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity [Abstract]
Common stock, authorized	80,000,000	80,000,000	80,000,000
Common stock, par value	$ 0.0013	$ 0.0013	$ 0.0013
Preferred stock, authorized	20,000,000	20,000,000	20,000,000
Preferred stock, par value	$ 0.001	$ 0.001	$ 0.001
Authorized amount of common shares under stock repurchase program		$ 15,000,000
Repurchased shares (in shares)		0	0	0
Remaining authorized amount of common shares under stock repurchase program		12,300,000
Common Stock sold in public offering (in shares)	12,650,000
Proceeds from public offering of common stock, net of underwriting discounts and commissions and offering expenses	$ 23,300,000	$ 23,348,000	$ 0	$ 0