Basis of Presentation and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Securities not included in the net loss per common share calculations

The following options to purchase common stock, restricted stock units and warrants to purchase common stock were excluded from the computation of diluted net loss per share of common stock for the three and nine months ended September 30, 2013 and 2012 (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2013	2012	2013	2012
Options to purchase common stock	4,805	7,228	4,805	7,228
Restricted stock units	1,665	839	1,665	839
Warrants to purchase common stock	75	260	75	260
Total	6,545	8,327	6,545	8,327