Income Taxes	3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, which requires that deferred tax assets and liabilities are recognized using enacted tax rates for the effect of temporary differences between the book and tax bases of recorded assets and liabilities. ASC 740 also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be realized. Based on its history of operating losses, the Company has offset its net deferred tax assets by a full valuation allowance. Any reversal of the corresponding valuation allowance will generally result in a tax benefit being recorded in the consolidated statement of operations in the respective period. For the three months ended March 31, 2015, the Company recognized a benefit from income taxes of $0.4 million, which primarily reflects the allowable benefit recognized from a valuation allowance adjustment resulting from an increase in deferred tax liabilities related to net unrealized gains on marketable securities. For the three months ended March 31, 2014, the Company recognized a provision for income taxes of $0.2 million, which primarily reflects state and alternative minimum taxes.

Income Taxes

3 Months Ended

Mar. 31, 2015

The Company accounts for income taxes in accordance with Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, which requires that deferred tax assets and liabilities are recognized using enacted tax rates for the effect of temporary differences between the book and tax bases of recorded assets and liabilities. ASC 740 also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be realized. Based on its history of operating losses, the Company has offset its net deferred tax assets by a full valuation allowance. Any reversal of the corresponding valuation allowance will generally result in a tax benefit being recorded in the consolidated statement of operations in the respective period.

For the three months ended March 31, 2015, the Company recognized a benefit from income taxes of $0.4 million, which primarily reflects the allowable benefit recognized from a valuation allowance adjustment resulting from an increase in deferred tax liabilities related to net unrealized gains on marketable securities. For the three months ended March 31, 2014, the Company recognized a provision for income taxes of $0.2 million, which primarily reflects state and alternative minimum taxes.