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Restricted Cash
6 Months Ended
Jun. 30, 2011
Cash, Cash Equivalents and Short-Term Investments and Restricted Cash [Abstract]  
Restricted Cash
(7) Restricted Cash
     As part of the Company’s lease arrangement for its office and laboratory facility, the Company was required to restrict $619,000 of cash for a security deposit. The restricted cash was reduced by a total of approximately $308,000 upon the second, third and fourth anniversaries of the June 2007 lease commencement date. As a result, at June 30, 2011, restricted cash was $311,000. The restricted cash is held in certificates of deposit securing a line of credit for the lessor.