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

3 Months Ended

Mar. 31, 2014

Securities not included in the net loss per common share calculations

The following options to purchase common stock, restricted stock units, performance 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 months ended March 31, 2014 and 2013 (in thousands):



	Three Months Ended March 31,
	2014	2013
Options to purchase common stock	4,333	5,117
Restricted stock units/awards	1,975	1,626
Performance stock units	775	523
Warrants to purchase common stock	75	260
Total shares excluded as anti-dilutive	7,158	7,526