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Stock-Based Compensation (Details) (USD $)
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12 Months Ended | 96 Months Ended | ||||||||
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Dec. 31, 2011
2004 Equity Incentive Plan
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Jul. 31, 2009
2008 Equity Incentive Plan
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Dec. 31, 2008
2008 Equity Incentive Plan
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Dec. 31, 2011
RSAs, certain members of Company's management
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Dec. 31, 2007
RSAs, certain members of Company's management
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Dec. 31, 2011
Employee stock purchase plan
M
period
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Dec. 31, 2011
Employee stock purchase plan
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Dec. 31, 2011
Performance-Contingent Restricted Stock Awards
Senior management
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Dec. 31, 2011
Performance-Contingent Restricted Stock Awards
Officer
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Dec. 31, 2011
Performance-Contingent Restricted Stock Units
Senior management
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| Information related to stock-based compensation | ||||||||||
| Additional number of shares of common stock approved and authorized for issuance | 200,000 | |||||||||
| Shares remaining available for issuance | 2,090,098 | 556,546 | 556,546 | |||||||
| Purchase price as a percentage of fair market value of stock | 85.00% | |||||||||
| Consecutive and overlapping offering periods (in months) | 24 | |||||||||
| Number of offering periods | 4 | |||||||||
| Duration of purchase period (in months) | 6 | |||||||||
| Maximum contributions as a percentage of employee's eligible compensation | 15.00% | |||||||||
| Common stock, shares issued since plan inception in 2004 | 1,468,454 | |||||||||
| Shares of common stock approved and authorized for issuance (in shares) | 500,000 | 1,168,000 | 71,000 | 2,025,000 | 2,025,000 | 1,290,000 | 25,000 | 210,000 | ||
| Cumulative average sale price per share as of the period end (in dollars per share) | $ 10.15 | |||||||||