Income Taxes	6 Months Ended
Jul. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the six months ended July 31, 2018 and 2017, the Company recorded a provision for income taxes of $0.3 million and $0.2 million, respectively. ASC 740 generally requires providing for income taxes during interim periods based on the estimated annual effective tax rate ("AETR") for the full fiscal year. For the three and six months ended July 31, 2018, the Company calculated its income tax provision as though the interim year to date period was an annual period, referred to herein as the discrete method. The Company believes that the application of the AETR method is impractical at this time, given that normal deviations in the projected pre-tax net income (loss) in certain jurisdictions could result in a disproportionate and unreliable effective tax rate under the AETR method. The Company's effective tax rate generally differs from the U.S. federal statutory tax rate primarily due to a full valuation allowance related to the Company's U.S. deferred tax assets, partially offset by the foreign tax rate differential on non-U.S. income. The Company regularly evaluates the realizability of its deferred tax assets and establishes a valuation allowance if it is more likely than not that some or all the deferred tax assets will not be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, loss carryback and tax-planning strategies. Generally, more weight is given to objectively verifiable evidence, such as the cumulative loss in recent years, as a significant piece of negative evidence to overcome. On December 22, 2017, the Tax Reform Act was enacted, which significantly revised the U.S. corporate income tax laws, including, but not limited to, lowering the top bracket of the federal statutory corporate tax rate from 35% to a flat rate of 21%. The Company continues to evaluate the impacts of the Tax Reform Act and considers the amounts recorded to be provisional and based on reasonable estimates, except for the remeasurement of its deferred taxes based on the new enacted rate, for which the accounting is complete. As the Company continues to assess its provision for income taxes, any adjustments to the provisional amounts arising from continued analysis of the Tax Reform Act or upon completion of its U.S. income tax return, will be recognized in accordance with SAB 118 measurement period guidance.

Income Taxes

For the six months ended July 31, 2018 and 2017, the Company recorded a provision for income taxes of $0.3 million and $0.2 million, respectively.

ASC 740 generally requires providing for income taxes during interim periods based on the estimated annual effective tax rate ("AETR") for the full fiscal year. For the three and six months ended July 31, 2018, the Company calculated its income tax provision as though the interim year to date period was an annual period, referred to herein as the discrete method. The Company believes that the application of the AETR method is impractical at this time, given that normal deviations in the projected pre-tax net income (loss) in certain jurisdictions could result in a disproportionate and unreliable effective tax rate under the AETR method.

The Company's effective tax rate generally differs from the U.S. federal statutory tax rate primarily due to a full valuation allowance related to the Company's U.S. deferred tax assets, partially offset by the foreign tax rate differential on non-U.S. income. The Company regularly evaluates the realizability of its deferred tax assets and establishes a valuation allowance if it is more likely than not that some or all the deferred tax assets will not be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, loss carryback and tax-planning strategies. Generally, more weight is given to objectively verifiable evidence, such as the cumulative loss in recent years, as a significant piece of negative evidence to overcome.

On December 22, 2017, the Tax Reform Act was enacted, which significantly revised the U.S. corporate income tax laws, including, but not limited to, lowering the top bracket of the federal statutory corporate tax rate from 35% to a flat rate of 21%. The Company continues to evaluate the impacts of the Tax Reform Act and considers the amounts recorded to be provisional and based on reasonable estimates, except for the remeasurement of its deferred taxes based on the new enacted rate, for which the accounting is complete. As the Company continues to assess its provision for income taxes, any adjustments to the provisional amounts arising from continued analysis of the Tax Reform Act or upon completion of its U.S. income tax return, will be recognized in accordance with SAB 118 measurement period guidance.