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Income Taxes | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Income Taxes | 12. Income Taxes ​ The Company has temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and their respective income tax basis, as measured by enacted state and federal rates as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31 |  | 2019 | ​ | 2018 | ​ | 2017 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforwards | ​ | $ | 36,250 | ​ | $ | 30,588 | ​ | $ | 27,578 | ​
Inventory write down | ​ | ​ | 317 | ​ | ​ | 273 | ​ | ​ | 206 | ​
Depreciation | ​ | ​ | 136 | ​ | ​ | 117 | ​ | ​ | — | ​
Amortization | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 23 | ​
Interest limitation | ​ | ​ | — | ​ | ​ | 336 | ​ | ​ | — | ​
Allowance for doubtful accounts | ​ | ​ | 274 | ​ | ​ | 285 | ​ | ​ | 117 | ​
Right-of-use liability | ​ | ​ | 837 | ​ | ​ | — | ​ | ​ | — | ​
Stock-based compensation | ​ | ​ | 3,140 | ​ | ​ | 2,335 | ​ | ​ | 520 | ​
Total deferred tax assets | ​ | ​ | 40,954 | ​ | ​ | 33,934 | ​ | ​ | 28,444 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (81) | ​
Amortization | ​ | ​ | (206) | ​ | ​ | (43) | ​ | ​ | — | ​
Right-of-use asset | ​ | ​ | (809) | ​ | ​ | — | ​ | ​ | — | ​
Contract liabilities | ​ | ​ | (7) | ​ | ​ | (15) | ​ | ​ | (6) | ​
Net deferred tax assets | ​ | ​ | 39,932 | ​ | ​ | 33,876 | ​ | ​ | 28,357 | ​
Valuation allowance | ​ | $ | (39,932) | ​ | $ | (33,876) | ​ | $ | (28,357) | ​
​ The difference between the financial statement income tax and the income tax benefit using statutory rates is primarily due to the increase in the valuation allowance. ​ The Company’s effective income tax rate differs from the statutory federal income tax rate as follows for the years ended December 31, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​
Federal tax rate | ​ | ​ | 21.0 | % | ​ | 21.0 | %
State Taxes - Net of Federal Benefit | ​ | ​ | 4.1 | ​ | ​ | 4.1 | ​
Permanent items and other deductions | ​ | ​ | (4.3) | ​ | ​ | (0.5) | ​
Valuation allowance | ​ | ​ | (20.8) | ​ | ​ | (24.6) | ​
Effective income tax rate | ​ | ​ | — | % | ​ | — | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ As of December 31, 2019 and 2018, management assessed the realizability of deferred tax assets. Management evaluated the need for an amount of any valuation allowance for deferred tax assets on a jurisdictional basis. This evaluation utilizes the framework contained in ASC 740, Income Taxes, wherein management analyzes all positive and negative evidence available at the balance sheet date to determine whether all or some portion of the Company’s deferred tax assets will not be realized. Under this guidance, a valuation allowance must be established for deferred tax assets when it is more likely than not (a probability level of more than 50%) that the Company may not realize the benefit of its deferred tax assets. In assessing the realization of the Company’s deferred tax assets, the Company considers all available evidence, both positive and negative. ​ In concluding on the evaluation, management placed significant emphasis on guidance in ASC 740, which states that “a cumulative loss in recent years is a significant piece of negative evidence that is difficult to overcome.” Based upon available evidence, it was concluded on a more-likely-than-not basis that all deferred tax assets were not realizable as of December 31, 2019. The valuation allowance increased by $6,056 and 5,519 during 2019 and 2018, primarily as a result of current year increase in the net operating loss carry forward. During 2017, the valuation allowance decreased by $10,754, primarily due to the remeasurement of the Company’s deferred tax assets and liabilities as a result of the Tax Reform enacted on December 22, 2017. ​ As of December 31, 2019, the Company had tax-effected net operating loss carry forwards of approximately $36,250 to offset future taxable income which expire in various years through 2039. Federal net operating losses incurred in tax years beginning on or after January 1, 2018 are carried forward indefinitely. A portion of the net operating loss carry forwards may expire due to limitations imposed by section 382 of the Internal Revenue Code. The Company files U.S. federal and state income tax returns in jurisdictions with varying statutes of limitations. In the normal course of business the Company is subject to examination by taxing authorities throughout the country. These audits could include examining the timing and amount of deductions, the allocation of income among various tax jurisdictions and compliance with federal, state and local laws. The Company’s tax years since 2017 remain subject to examination by federal, state and foreign tax authorities. The Company adopted Accounting Standards Codification (“ASC”) Topic 842 – Leases, on January 1, 2019. Under Topic 842, the Company is required to recognize the assets and liabilities that arise from most operating leases on the balance sheet. Upon adoption, no change in retained earnings was recorded related to income taxes as the Company maintains a full valuation allowance. As of the implementation date, an adjustment of $951 was recorded as a deferred tax liability and an adjustment of $961 was recorded as a deferred tax asset. See above for more information about the non-income tax impact of the adoption of the new leasing standard. Legislation enacted in 2017, informally titled the Tax Cuts and Jobs Act of 2017, subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. The Company has elected to account for GILTI in the year the tax is incurred. ​ The Company had no income tax expense or income tax benefit for 2017, 2018 and 2019 due to incurrence of net operating losses. The Company does not believe there are any additional tax refund opportunities currently available.

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- Definition 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. + References 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 + Details
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