Income Taxes	6 Months Ended
Jun. 30, 2018
INCOME TAXES
INCOME TAXES	15. INCOME TAXES For the three and six months ended June 30, 2018, the Company recorded a provision for income taxes of $4,000 and $16,000, respectively. For the three and six months ended June 30, 2017, the Company recorded a provision of $1,000 and a benefit of $11,000, respectively. The benefit and provision for income taxes for each of the periods was primarily comprised of state taxes during the period. The Company periodically evaluates the realizability of its net deferred tax assets based on all available evidence, both positive and negative. The realization of net deferred tax assets is dependent on the Company’s ability to generate sufficient future taxable income during periods prior to the expiration of tax attributes to fully utilize these assets. The Company weighed both positive and negative evidence and determined that there is a continued need for a full valuation allowance on its deferred tax assets in the United States as of June 30, 2018. Should the Company determine that it would be able to realize its remaining deferred tax assets in the foreseeable future, an adjustment to its remaining deferred tax assets would cause a material increase to income in the period such determination is made. As of June 30, 2018, the Company’s unrecognized tax benefits were related to federal and California research and development credits which result in an unrecognized tax benefit balance of $133,000. The Company does not expect to have any other significant changes to unrecognized tax benefits through the end of the fiscal year. Because of the Company’s history of tax losses, certain tax years remain open to tax audit. The Company’s policy is to recognize interest and penalties related to uncertain tax positions (if any) as a component of the income tax provision.

15. INCOME TAXES

For the three and six months ended June 30, 2018, the Company recorded a provision for income taxes of $4,000 and $16,000, respectively. For the three and six months ended June 30, 2017, the Company recorded a provision of $1,000 and a benefit of $11,000, respectively. The benefit and provision for income taxes for each of the periods was primarily comprised of state taxes during the period.

The Company periodically evaluates the realizability of its net deferred tax assets based on all available evidence, both positive and negative. The realization of net deferred tax assets is dependent on the Company’s ability to generate sufficient future taxable income during periods prior to the expiration of tax attributes to fully utilize these assets. The Company weighed both positive and negative evidence and determined that there is a continued need for a full valuation allowance on its deferred tax assets in the United States as of June 30, 2018. Should the Company determine that it would be able to realize its remaining deferred tax assets in the foreseeable future, an adjustment to its remaining deferred tax assets would cause a material increase to income in the period such determination is made.

As of June 30, 2018, the Company’s unrecognized tax benefits were related to federal and California research and development credits which result in an unrecognized tax benefit balance of $133,000. The Company does not expect to have any other significant changes to unrecognized tax benefits through the end of the fiscal year. Because of the Company’s history of tax losses, certain tax years remain open to tax audit. The Company’s policy is to recognize interest and penalties related to uncertain tax positions (if any) as a component of the income tax provision.