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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS DATA (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Supplemental Operating Activities:    
Issuance of common stock for performance bonus   $ 2,807
Issuance of common stock for 401(k) matching contributions 1,361 1,294
Issuance of common stock for acquired in-process research and development   27,500
Issuance of common stock for services rendered to date or to be received in future periods 69 251
Reclassification between deposits and other current assets 135 (345)
Supplemental Investing Activities:    
Net unrealized (loss) gain on marketable securities $ (6) $ 42