Fair Value Measurements - Financial Assets Categorized Based on Priority of Inputs to Valuation Technique Instruments (Details) - USD ($) $ in Thousands	Feb. 01, 2020	Feb. 02, 2019
Fair Value, Inputs, Level 1 | Cash Equivalents | Money Market Instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents	$ 58,614	$ 56,856
Fair Value, Inputs, Level 1 | Cash Equivalents | Commercial Paper
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents	0	0
Fair Value, Inputs, Level 1 | Marketable Securities | Commercial Paper
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable securities	0	0
Fair Value, Inputs, Level 2 | Cash Equivalents | Money Market Instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents	0	0
Fair Value, Inputs, Level 2 | Cash Equivalents | Commercial Paper
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents	0	4,975
Fair Value, Inputs, Level 2 | Marketable Securities | Commercial Paper
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable securities	54,756	49,704
Fair Value, Inputs, Level 3 | Cash Equivalents | Money Market Instruments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents	0	0
Fair Value, Inputs, Level 3 | Cash Equivalents | Commercial Paper
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash equivalents	0	0
Fair Value, Inputs, Level 3 | Marketable Securities | Commercial Paper
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable securities	$ 0	$ 0