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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Schedule of differences between the carrying amount of assets and liabilities for financial reporting purposes and their respective income tax basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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) | ​
Schedule of effective income tax rate differs from the statutory federal income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | ​ | — | % | ​ | — | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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