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100640 - Disclosure - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail)
(http://www.ambarella.com/20170131/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001280263 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2017-01-31
2016-01-31
Income Tax Disclosure [Abstract]
 
 
Deferred tax assets:
 
 
Federal and state credits
14,782,000  
11,852,000  
Expenses not currently deductible
2,381,000  
2,331,000  
Stock-based compensation
3,561,000  
2,503,000  
Foreign deferred
161,000  
0  
Gross deferred tax assets
20,885,000  
 
16,686,000  
 
Valuation allowance
(15,061,000) 
(12,072,000) 
Total deferred tax assets
5,824,000  
 
4,614,000  
 
Deferred tax liabilities
 
 
Property and equipment
(1,383,000) 
(1,378,000) 
Foreign deferred
0  
(33,000) 
Net deferred tax assets
4,441,000  
 
3,203,000