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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Research and development tax credit carryforwards $ 27,607,000 $ 23,244,000
Investment tax credit carryforwards 2,102,000 1,976,000
Stock-based compensation 1,587,000 3,133,000
Inventory reserves 1,522,000 2,109,000
Vacation accrual 1,280,000 1,218,000
Deferred revenue, net 796,000 66,000
Lease liabilities 679,000  
UNICAP 351,000 275,000
Net operating loss carryforwards 328,000 1,091,000
International deferred tax assets 205,000 265,000
Sales allowances 172,000 128,000
Unrealized loss on investments 132,000 132,000
Contingent consideration liabilities 98,000 88,000
Warranty reserves 66,000 35,000
Bad debt reserves 14,000 52,000
Other 225,000 233,000
Total deferred tax assets 37,164,000 34,045,000
Less: Valuation allowance for deferred tax assets (30,363,000) (30,031,000)
Net deferred tax assets 6,801,000 4,014,000
Deferred tax liabilities:    
Depreciation (5,296,000) (3,144,000)
ROU assets (653,000)  
Prepaid expenses (552,000) (473,000)
Patent amortization (91,000) (107,000)
Other (4,000) (25,000)
Total deferred tax liabilities (6,596,000) (3,749,000)
Net deferred tax assets (liabilities) $ 205,000 $ 265,000