Stock Based Compensation (Details 5) (USD $)
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12 Months Ended | 3 Months Ended | 24 Months Ended | 3 Months Ended | |||||||||
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Dec. 31, 2011
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Mar. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2013
2000 Stock Incentive Plan
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Dec. 31, 2012
2000 Stock Incentive Plan
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Mar. 31, 2013
Restricted stock units
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Mar. 31, 2012
Restricted stock units
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Mar. 31, 2013
Restricted stock units
General and administrative expenses
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Mar. 31, 2012
Restricted stock units
General and administrative expenses
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Mar. 31, 2013
Restricted stock units
Research and development expenses
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Mar. 31, 2013
Restricted stock units
Minimum
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Mar. 31, 2013
Restricted stock units
Maximum
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Mar. 31, 2012
Restricted stock units
Maximum
Research and development expenses
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Stock Based Compensation disclosures | |||||||||||||
Number of common shares each award holder is entitled to receive | 1 | ||||||||||||
Requisite service period of RSUs | 1 year | 3 years | |||||||||||
Number of RSUs | |||||||||||||
Outstanding, beginning balance (in shares) | 215,525 | ||||||||||||
Granted (in shares) | 53,730 | ||||||||||||
Released (in shares) | (68,803) | ||||||||||||
Outstanding, ending balance (in shares) | 200,452 | ||||||||||||
Expected to Vest (in shares) | 192,388 | ||||||||||||
Weighted Average Grant Price | |||||||||||||
Outstanding weighted average grant price (in dollars per share) | $ 6.26 | ||||||||||||
Granted (in dollars per share) | $ 6.67 | ||||||||||||
Released (in dollars per share) | $ 3.69 | ||||||||||||
Outstanding weighted average grant price (in dollars per share) | $ 7.26 | ||||||||||||
Expected to Vest (in dollars per share) | $ 7.25 | ||||||||||||
Allocated share-based compensation expense | $ 300,000 | $ 300,000 | $ 200,000 | $ 300,000 | $ 100,000 | $ 100,000 | |||||||
Unrecognized compensation expense related to unvested RSU's | 600,000 | ||||||||||||
Expected weighted average period for recognizing unrecognized compensation expense | 10 months 24 days | ||||||||||||
RSUs and stock options in excess of the per person annual sub-limits | 1,400,000 | 1,400,000 | |||||||||||
Reverse stock split | 0.1 | ||||||||||||
Liability for stock based compensation awards | $ 1,808,000 | $ 1,204,000 | $ 1,800,000 |