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Stock Options (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Stock options
Jun. 04, 2008
2008 Plan
Dec. 31, 2012
2008 Plan
item
Dec. 31, 2012
2008 Plan
ISO
Dec. 31, 2012
2008 Plan
ISO
Minimum
Dec. 31, 2012
2008 Plan
ISO
Minimum
Participant who owns more than 10%
Nov. 26, 2008
2008 Plan after November 2008 amendment
Mar. 25, 2010
2008 Plan after 2010 amendment
Dec. 31, 2009
2008 Plan after 2010 amendment
Share-based compensation                  
Shares authorized   280,000 1,991,731       630,000 2,850,000 1,130,000
Increase in number of shares authorized             350,000 1,720,000  
Additional number of shares reserved for issuance per year   100,000         250,000    
Increase in additional number of shares reserved for issuance per year             150,000    
Exercise price expressed as a percentage of the fair market value         100.00% 110.00%      
Ownership percentage that triggers a higher exercise price           10.00%      
Maximum aggregate fair market value of shares under options granted required to qualify as an ISO       $ 100,000          
Term of options       10 years          
Number of eligible employees to participate in the plan     245            
Expiration term of award 10 years