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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) Non-Cash Activities (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Other Significant Noncash Transactions [Line Items]    
Unrealized loss on available-for-sale securities $ 58 $ 36
Common stock issued to Board of Directors and Scientific Advisory Board that was earned and accrued for in a previous period
    
Other Significant Noncash Transactions [Line Items]    
Other significant noncash transactions 323 300
Common stock issued to employees that was earned and accrued for in a previous period
    
Other Significant Noncash Transactions [Line Items]    
Other significant noncash transactions 746 282
Net change in accounts payable and accrued expenses related to purchases of property and equipment
    
Other Significant Noncash Transactions [Line Items]    
Other significant noncash transactions $ 64 $ 891