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Subsequent Event	6 Months Ended
Subsequent Event	Jul. 31, 2019
Subsequent Events [Abstract]
Subsequent Event	Subsequent events Share Repurchase Program In August 2019, our board of directors approved a share repurchase program. All material terms of this program are disclosed in Note 9 Stockholders’ Equity. Departure of Officer In August 2019, we announced that Timothy Riitters, our Chief Financial Officer, will be departing later this year. Mr. Riitters' departure is not related to any issues regarding the integrity of our financial statements, accounting policies and practices.