Income Taxes	6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The provision for income taxes for the six months ended June 30, 2019 and 2018 reflects current taxes, deferred taxes, and withholding taxes. The effective tax rate for each of the six months ended June 30, 2019 and 2018 was 0%. The valuation allowance against net deferred tax assets as of June 30, 2019 was $47,577, an increase of $5,228 from $42,349 as of December 31, 2018. Excess tax benefits of $2,236 and $2,044 were recognized in the provision for income taxes for the three and six months ended June 30, 2019, respectively, which were offset by $2,236 and $2,044 of valuation allowance, respectively. Excess tax benefits of $186 and $711 were recognized in the provision for income taxes for the three and six months ended June 30, 2018, respectively, which were offset by $186 and $711 of valuation allowance, respectively.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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