Stockholders' Equity and Employee Stock Option Plans Exercise Price ranges and related information for options and SARS (Tables)

12 Months Ended

Dec. 31, 2012

Exercise Price ranges and related information for options and SARS [Abstract]

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The following table provides additional information for significant ranges of outstanding and exercisable stock options and stock appreciation rights as of December 31, 2012:

Exercise Price Range	Number Outstanding	Weighted Average Remaining Contractual Life (in years)	Weighted Average Exercise Price per Share		Aggregate Intrinsic Value
2.51-2.57	11,400	9.88	$	2.57	—
3.17	1,662,084	9.39	3.17		—
3.40-7.46	601,775	4.73	5.97		—
7.47	499,059	1.37	7.47		—
7.69	414,401	0.96	7.69		—
7.89-10.62	454,450	2.03	9.43		—
11.33-13.32	279,396	0.94	12.79		—
13.85	6,750	1.78	13.85		—
15.45	1,000	0.27	15.45		—
18.55	9,000	0.03	18.55		—
Outstanding	3,939,315	5.29	$	6.08	—
Vested and expected to vest	3,778,267	5.28	$	6.18	—
Exercisable	1,696,476	1.63	$	8.54	—