About: http://webisa.webdatacommons.org/157444015

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	the effective tax rate has been volatile and difficult to forecast due to the valuation allowance against our deferred tax assets, stock-based compensation, our ability to use tax credits and other adjustments.
http://www.w3.org/ns/prov#wasQuotedFrom	sec.gov