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Income Taxes - Schedule of Significant Components of the Deferred Income Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | $ 15,399,000 |  |  |  | $ 1,154,000 |  |  |  | $ 66,000 | $ 0
Research and development credits | 2,806,000 |  |  |  | 2,118,000 |  |  |  | 139,000 | 0
Other state credits | 989,000 |  |  |  | 407,000 |  |  |  | 164,000 | 0
Inventory | 2,560,000 |  |  |  | 5,837,000 |  |  |  | 5,094,000 | 3,035,000
Allowances and bad debts | 596,000 |  |  |  | 501,000 |  |  |  | 334,000 | 119,000
Accrued warranty | 3,387,000 |  |  |  | 3,820,000 |  |  |  | 1,413,000 | 948,000
Accrued wages and benefits | 351,000 |  |  |  | 786,000 |  |  |  | 893,000 | 917,000
Stock-based compensation | 645,000 |  |  |  | 1,021,000 |  |  |  | 756,000 | 576,000
Capitalized research and development costs | 1,090,000 |  |  |  | 2,291,000 |  |  |  | 2,617,000 | 2,316,000
Intangible amortization | 1,734,000 |  |  |  | 4,519,000 |  |  |  | 4,311,000 | 0
Other | 3,397,000 |  |  |  | 6,638,000 |  |  |  | 5,069,000 | 3,615,000
Total deferred tax assets | 32,954,000 |  |  |  | 29,092,000 |  |  |  | 20,856,000 | 11,526,000
Valuation allowance | (31,992,000) |  |  |  | (26,847,000) |  | $ (17,800,000) |  | 0 | 0
Total deferred tax assets, net of valuation allowance | 962,000 |  |  |  | 2,245,000 |  |  |  | 20,856,000 | 11,526,000
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |
Intangible amortization | 0 |  |  |  | 0 |  |  |  | 0 | (1,091,000)
Tax depreciation in excess of book depreciation on property, plant and equipment | (1,665,000) |  |  |  | (2,709,000) |  |  |  | (3,199,000) | (1,870,000)
Total deferred tax liabilities | (1,665,000) |  |  |  | (2,709,000) |  |  |  | (3,199,000) | (2,961,000)
Net deferred tax (liability) asset | (703,000) |  |  |  | (464,000) |  |  |  |  |
Current deferred tax assets, net |  |  |  |  |  |  |  |  |  | 8,552,000
Net deferred tax (liability) asset | (703,000) | $ (1,210,000) | $ (1,066,000) | $ (933,000) | (464,000) | $ (522,000) | (372,000) | $ 0 | 0 |
Deferred income taxes | $ 0 |  |  |  | $ 0 | $ 0 | $ 0 | $ 19,285,000 | 17,657,000 | 13,000
Net deferred tax asset |  |  |  |  |  |  |  |  | $ 17,657,000 | $ 8,565,000

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