Supplemental Disclosure for Statements of Cash Flows	3 Months Ended
Supplemental Disclosure for Statements of Cash Flows	Mar. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure for Statements of Cash Flows	Supplemental Disclosure for Statements of Cash Flows During the three-month periods ended March 31, 2014 and 2013, we paid interest aggregating $907,000 and $242,000, respectively. During the three-month period ended March 31, 2013, we issued 22,126 shares of our common stock, as matching contributions to our 401(k) plan. In connection with entering into the Oxford Loan Agreement, we issued warrants with an estimated relative fair value of $465,000.