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Stock-Based Compensation (Details Textual) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 Plan | Dec. 31, 2012
Stock-based compensation (Textual) [Abstract] |  |
Shares authorized | 75,000,000 | 75,000,000
Vesting period of grant date | 1 year |
Number of restricted unit would vest over vesting period | 55,200 |
Restricted stock unit vest description | 55,200 of these restricted stock units will vest and convert into shares of our common stock over a four year period |
Stock Based Compensation (Additional Textual) [Abstract] |  |
Equity Incentive Plans | 2 |
Total unrecognized compensation expense | $ 1,875,000 |
Vesting period | 1 year 9 months 18 days |
Number of restricted unit vest over next fiscal year | 10,000 |
Number of restricted unit would vest over vesting period | 55,200 |
Restricted Stock Units Vested Description After Specified Period | 0.25 |
Exercise price | $ 20.00 |
Options [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Term of years | 4 years |
Percentage of vested grant date | 25.00% |
Percentage of vested grant date | 75.00% |
Unexercised vested option forfeiture | 3 months |
Estimated fair value | $ 124,000 |
Options [Member] | Maximum [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Term of years | 10 years |
Vesting period of grant date | 3 years |
Stock Appreciation Rights (SARs) [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Percentage of vested grant date | 25.00% |
Percentage of vested grant date | 75.00% |
Vesting period of grant date | 3 years |
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Term of years | 10 years |
Restricted Stock One [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Restricted stock units vest and convert into shares of our common stock | 1 year |
Restricted Stock Three [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Restricted stock units vest and convert into shares of our common stock | 4 years |
Equity incentive plans [Member] |  |
Stock-based compensation (Textual) [Abstract] |  |
Shares authorized |  | 593,199
Annual increase in number of shares of common stock | 4.00% |
Aggregate limit of shares issuable to incentive stock option awards | 3,000,000 |

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