Consolidated Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Collaborative agreements	$ 1,792us-gaap_ContractsRevenue	$ 172us-gaap_ContractsRevenue
Subscription and license fees	0us-gaap_LicensesRevenue	105us-gaap_LicensesRevenue
Total revenues	1,792us-gaap_Revenues	277us-gaap_Revenues
Operating expenses:
Research and development, including stock-based compensation of $1,104 and $1,458, respectively	20,865us-gaap_ResearchAndDevelopmentExpense	23,953us-gaap_ResearchAndDevelopmentExpense
Increase in fair value of Symphony Icon, Inc. purchase liability	1,753	1,142
General and administrative, including stock-based compensation of $849 and $792, respectively	5,701us-gaap_GeneralAndAdministrativeExpense	5,654us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	28,319us-gaap_OperatingExpenses	30,749us-gaap_OperatingExpenses
Loss from operations	(26,527)us-gaap_OperatingIncomeLoss	(30,472)us-gaap_OperatingIncomeLoss
Interest expense	(1,702)us-gaap_InterestExpense	(457)us-gaap_InterestExpense
Interest and other income, net	153us-gaap_OtherNonoperatingIncomeExpense	94us-gaap_OtherNonoperatingIncomeExpense
Consolidated net loss	(28,076)us-gaap_NetIncomeLoss	(30,835)us-gaap_NetIncomeLoss
Consolidated net loss per common share, basic and diluted	$ (0.04)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing consolidated net loss per common share, basic and diluted	724,613	513,955
Unrealized gain on investments	86	8
Comprehensive loss	$ (27,990)us-gaap_ComprehensiveIncomeNetOfTax	$ (30,827)us-gaap_ComprehensiveIncomeNetOfTax

This item represents the change in fair value of the Symphony Icon, Inc. purchase liability. In connection with the acquisition of Symphony Icon, Lexicon made an initial estimate of the fair value of the liability for the associated based and contingent payments. Changes in this liability, based on the development of the programs and the time until such payments are expected to be made, are recorded in Lexicon's consolidated statements of operations.

No definition available.