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Convertible Senior Notes, Net - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Debt Instrument [Line Items]
Total	$ 14,207
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	606	$ 793
Amortization of debt issuance costs	985	1,085
Amortization of debt discount	11,219	13,194
Total	12,810	$ 15,072
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	519
Amortization of debt issuance costs	769
Amortization of debt discount	$ 12,919

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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