Stock Options Narrative (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Stock Options [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Unrecognized stock-based compensation expense for stock options	$ 2,133
Unrecognized stock-based compensation expense, stock options, upon change in control, value	547
Unrecognized stock-based compensation expense, stock options, upon change in control, shares	275
Unrecognized stock-based compensation expense, stock options, amortized for weighted average period	$ 1,586
Weighted average period for amortization of unrecognized stock-based compensation, stock options	1 year 8 months 12 days
Less than 10% Stockholder [Member] | Employees [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Stockholder's ownership interest	10.00%
Incentive stock options, exercise price, percent of fair value (less than)	100.00%
10% or more Stockholder [Member] | Employees [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Stockholder's ownership interest	10.00%
Incentive stock options, exercise price, percent of fair value (less than)	110.00%