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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Jan. 31, 2019
Financial Assets:    
Cash equivalents $ 134,203 $ 78
Marketable securities 541,380 112,777
Commercial paper    
Financial Assets:    
Cash equivalents 14,239  
Marketable securities 54,007 1,243
Corporate bonds    
Financial Assets:    
Marketable securities   53,214
Agency bonds    
Financial Assets:    
Marketable securities 18,399 32,604
Corporate and other debt securities    
Financial Assets:    
Marketable securities 269,209  
U.S. government agency securities    
Financial Assets:    
Marketable securities 97,762 24,017
Fair Value ,Recurring Basis    
Financial Assets:    
Cash equivalents 134,203 78
Marketable securities 541,380 112,777
Prepaid expenses and other current assets 100 200
Other assets, non-current 2,044 2,144
Total financial assets 677,727 115,199
Financial Liabilities:    
Convertible promissory notes – derivative liabilities   163
Other liabilities, non-current   163
Total financial liabilities   163
Fair Value ,Recurring Basis | Money market funds    
Financial Assets:    
Cash equivalents 95,577 78
Fair Value ,Recurring Basis | Commercial paper    
Financial Assets:    
Cash equivalents 14,239  
Fair Value ,Recurring Basis | Corporate debt securities    
Financial Assets:    
Cash equivalents 4,900  
Fair Value ,Recurring Basis | Treasury bills    
Financial Assets:    
Cash equivalents 19,487  
Fair Value ,Recurring Basis | Commercial paper    
Financial Assets:    
Marketable securities 54,007 1,243
Fair Value ,Recurring Basis | Corporate bonds    
Financial Assets:    
Marketable securities   53,214
Fair Value ,Recurring Basis | Agency bonds    
Financial Assets:    
Marketable securities 18,399 32,604
Fair Value ,Recurring Basis | Corporate and other debt securities    
Financial Assets:    
Marketable securities 269,209  
Fair Value ,Recurring Basis | U.S. government agency securities    
Financial Assets:    
Marketable securities 97,762 24,017
Fair Value ,Recurring Basis | Treasury bills    
Financial Assets:    
Marketable securities 102,003 1,699
Fair Value ,Recurring Basis | Certificate of deposit    
Financial Assets:    
Prepaid expenses and other current assets 100 200
Other assets, non-current 2,044 2,144
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1    
Financial Assets:    
Cash equivalents 95,577 78
Marketable securities 0 0
Prepaid expenses and other current assets 0 0
Other assets, non-current 0 0
Total financial assets 95,577 78
Financial Liabilities:    
Convertible promissory notes – derivative liabilities   0
Other liabilities, non-current   0
Total financial liabilities   0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Money market funds    
Financial Assets:    
Cash equivalents 95,577 78
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper    
Financial Assets:    
Cash equivalents 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Corporate debt securities    
Financial Assets:    
Cash equivalents 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills    
Financial Assets:    
Cash equivalents 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Corporate bonds    
Financial Assets:    
Marketable securities   0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Agency bonds    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | U.S. government agency securities    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 1 | Certificate of deposit    
Financial Assets:    
Prepaid expenses and other current assets 0 0
Other assets, non-current 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2    
Financial Assets:    
Cash equivalents 38,626 0
Marketable securities 541,380 112,777
Prepaid expenses and other current assets 100 200
Other assets, non-current 2,044 2,144
Total financial assets 582,150 115,121
Financial Liabilities:    
Convertible promissory notes – derivative liabilities   0
Other liabilities, non-current   0
Total financial liabilities   0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Money market funds    
Financial Assets:    
Cash equivalents 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper    
Financial Assets:    
Cash equivalents 14,239  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Corporate debt securities    
Financial Assets:    
Cash equivalents 4,900  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills    
Financial Assets:    
Cash equivalents 19,487  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper    
Financial Assets:    
Marketable securities 54,007 1,243
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Corporate bonds    
Financial Assets:    
Marketable securities   53,214
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds    
Financial Assets:    
Marketable securities 18,399 32,604
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 269,209  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | U.S. government agency securities    
Financial Assets:    
Marketable securities 97,762 24,017
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills    
Financial Assets:    
Marketable securities 102,003 1,699
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 2 | Certificate of deposit    
Financial Assets:    
Prepaid expenses and other current assets 100 200
Other assets, non-current 2,044 2,144
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3    
Financial Assets:    
Cash equivalents 0 0
Marketable securities 0 0
Prepaid expenses and other current assets 0 0
Other assets, non-current 0 0
Total financial assets 0 0
Financial Liabilities:    
Convertible promissory notes – derivative liabilities   163
Other liabilities, non-current   163
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Money market funds    
Financial Assets:    
Cash equivalents 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper    
Financial Assets:    
Cash equivalents 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Corporate debt securities    
Financial Assets:    
Cash equivalents 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills    
Financial Assets:    
Cash equivalents 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Corporate bonds    
Financial Assets:    
Marketable securities   0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Agency bonds    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Corporate and other debt securities    
Financial Assets:    
Marketable securities 0  
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | U.S. government agency securities    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills    
Financial Assets:    
Marketable securities 0 0
Fair Value ,Recurring Basis | Fair Value, Inputs, Level 3 | Certificate of deposit    
Financial Assets:    
Prepaid expenses and other current assets 0 0
Other assets, non-current $ 0 $ 0