Commission revenue attributable to major medical individual and family health insurance plans was 75%, 69% and 61% of commission revenue in the years ended December 31, 2012, 2013, and 2014 respectively. The decline in the percentage of commission revenue attributable to major medical individual and family health insurance plans in 2013 compared to 2012 was due primarily to increases in commission revenue attributable to both ancillary health insurance plans, consisting primarily of dental, accident and vision insurance plan offerings, and Medicare-related health insurance plans.
2014 compared to 2013 and 2013 compared to 2012-Other income (expense), remained relatively flat in 2014 compared to 2013 and net decreased in 2013 compared to 2012 due primarily to a decrease in investment interest income due to lower cash balances and declining average yields as well as higher bank fees.
2014-Our operating activities generated cash of $1.8 million during the year ended December 31, 2014 and consisted of net loss of $16.2 million, increased by non-cash items of $22.9 million and cash used in working capital and other activities of $4.9 million. Adjustments for non-cash items primarily consisted of $9.2 million of deferred income taxes, $5.9 million of stock-based compensation expense, $4.2 million of depreciation and amortization, $2.0 million of amortization of book-of-business consideration and $1.5 million of amortization of intangible assets. Cash used in working capital and other activities primarily consisted of a decrease of $1.1 million in deferred revenue, a decrease of $2.1 million in accrued compensation and benefits, an increase of $3.6 million in accounts receivable and a $0.6 million increase in prepaid expense and other assets, partially offset an increase of $0.5 million in accrued marketing expenses, a $0.4 million increase in other current liabilities and an increase of $1.6 million in accounts payable. Accounts receivable increased mainly due to increased commission receivables arising from CMS rule changes surrounding the timing of payments. Accounts payable increased due to increased marketing and advertising expenses during the open enrollment period.
Our investing activities primarily consist of purchases of computer hardware and software to enhance our website and customer care operations, leasehold improvements related to facilities expansion and consideration paid to a partner in connection with the transfer to us of certain Medicare plan members for whom we expect to earn future commissions.
Recently Adopted Accounting Standards-Effective January 1, 2014, we adopted an accounting standards update with new guidance on the presentation of unrecognized tax benefits. This standard requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The adoption of this standard did not have a material effect on our consolidated financial statements.
We used observable prices in active markets in determining the classification of our money market funds as Level 1 as of December 31, 2013 and 2014.
The provision (benefit) for income taxes consisted of the following (in thousands):
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, together with net operating loss and tax credit carry forwards. Significant components of our deferred tax assets were as follows (in thousands):
Assessing the realizability of our deferred tax assets is dependent upon several factors, including the likelihood and amount, if any, of future taxable income in relevant jurisdictions during the periods in which those temporary differences become deductible. We forecast taxable income by considering all available positive and negative evidence, including our history of operating income and losses and our financial plans and estimates that we use to manage the business. These assumptions require significant judgment about future taxable income. As a result, the amount of deferred tax assets considered realizable is subject to adjustment in future periods if estimates of future taxable income change. We recorded a valuation allowance of $11.5 million in the 2014 financial statements, which represents a full valuation allowance against the Company’s federal and state deferred tax assets. The valuation allowance was recorded as a result of increased uncertainty regarding the Company’s future taxable income and a lack of sources of other taxable income.