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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