|
Stock-Based Compensation (Details) (USD $)
|
3 Months Ended | 1 Months Ended | 3 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013
|
Mar. 31, 2012
|
Mar. 31, 2013
Restricted Stock [Member]
|
Feb. 28, 2013
Restricted Stock [Member]
|
Mar. 31, 2013
Restricted Stock [Member]
|
Mar. 31, 2013
The 1996 Plan [Member]
|
Mar. 31, 2013
The 1996 Plan [Member]
Minimum [Member]
|
Mar. 31, 2013
The 1996 Plan [Member]
Maximum [Member]
|
Mar. 31, 2013
The 2002 Plan [Member]
|
Mar. 31, 2013
The 2002 Plan [Member]
Minimum [Member]
|
Mar. 31, 2013
The 2002 Plan [Member]
Maximum [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||
| Number of stock based compensation plans in which instruments are outstanding | 2 | ||||||||||
| Stock based compensation, outstanding stock options' expiration period | 10 years | 10 years | |||||||||
| Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment | 90 days | 90 days | |||||||||
| Stock compensation expense | $ 742,860 | $ 418,304 | |||||||||
| Unrecognized compensation cost related to unvested stock-based awards | 3,900,000 | ||||||||||
| Unrecognized compensation cost related to unvested stock-based awards, weighted average recognition period | 2 years 2 months 12 days | ||||||||||
| Total number of shares authorized | 1,500,000 | 12,000,000 | |||||||||
| Stock based compensation, granted stock options' vesting period | 1 year | 4 years | 1 year | 4 years | |||||||
| Shares of restricted stock vested | 560,000 | 100,000 | 660,000 | ||||||||
| Aggregate fair value of restricted stock vested | $ 1,800,000 | $ 308,000 | |||||||||