XML 25 R24.htm IDEA: XBRL DOCUMENT v2.4.0.6
Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 31, 2012
Stock Issued
Feb. 29, 2012
Restricted Stock Units (RSUs)
Jun. 30, 2012
Restricted Stock Units (RSUs)
Jun. 30, 2012
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]                  
Shares issued, exercise of stock options   1,931,388 1,169,898 2,485,647 2,164,647        
Net proceeds from exercise of stock options   $ 5,900,000 $ 3,200,000 $ 6,678,000 $ 4,954,000        
Gross proceeds from exercise of stock options   5,880,000 3,300,000 6,670,000 5,000,000        
Shares issued, exercise of warrants   9,772,622 5,773,278 9,812,622 10,330,642        
Gross proceeds from exercise of warrants   14,900,000 8,600,000 14,960,000 15,200,000        
Net proceeds from exercise of warrants   14,870,000 8,500,000 14,930,000 14,930,000        
Restricted stock units granted             584,400    
Restricted stock units, expiration date             Feb. 01, 2015    
Expenses related to vesting of the RSU               600,000 1,000,000
Restricted stock units, shares issued           97,398      
Common stock issued, shares 13,800,000                
Common stock issued, price per share $ 7.60                
Gross proceed from common shares issued 104,900,000                
Proceed from common shares issued $ 98,700,000       $ 98,654,000