Debt	12 Months Ended
Jan. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt Loan and Security Agreement On March 10, 2014, the Company entered into a line of credit and term loan agreement with Silicon Valley Bank (SVB) in the amount of $5 million and $10.0 million, respectively. On June 17, 2015, the Company expanded its line of credit from $5.0 million to $20.0 million and extended the term by one year to mature on March 10, 2017. On November 21, 2016, the Company amended the agreement to extend the maturity date to November 21, 2018 and increase the borrowing capacity of the line of credit (Revolving Line) to $40.0 million. The available amount, not to exceed $40.0 million, is based on certain revenue metrics and is reduced by letters of credit totaling $4.2 million as of January 31, 2018 established in connection with facility lease agreements. As of January 31, 2018, $35.8 million was available under the Revolving Line. Proceeds from loans made under the Revolving Line may be borrowed, repaid and reborrowed until November 21, 2018. Repayment of any outstanding proceeds are payable on November 21, 2018, but may be prepaid without penalty. Borrowings under the Revolving Line bear interest at an annual rate based on the one-year Prime rate plus a spread of 0.75%. Interest is payable quarterly. The Company is required to pay a quarterly facility fee to SVB of 0.15% per annum on the average undrawn portion available under the facility plus balances of outstanding letters of credits. Additionally, the Company is required to pay an upfront, one-time, commitment fee of $0.1 million and annual anniversary fees of $0.1 million on the amendment’s first and second anniversary dates. As of January 31, 2018 and 2017, no amounts had been drawn under the Revolving Line and the Company was in compliance with all covenants pursuant to the loan and security agreement. As part of the initial loan agreement, upon closing, the Company granted SVB a warrant to purchase 187,500 shares of common stock at $1.40 per share, with a potential to acquire up to an additional 112,500 shares of common stock at the same price, which right would be triggered upon future amounts drawn under the loan agreement. No additional amounts were drawn under the credit facility and as such, the conditional warrant to acquire up to an additional 112,500 shares was not issued. The fair value of the common stock warrant at the time of issuance was recorded as debt issuance costs. Upon exercise of the warrant in March 2017 in conjunction with the IPO, 168,750 shares were issued and 18,750 shares were withheld by the Company in lieu of cash exercise.

Debt

Loan and Security Agreement

On March 10, 2014, the Company entered into a line of credit and term loan agreement with Silicon Valley Bank (SVB) in the amount of $5 million and $10.0 million, respectively. On June 17, 2015, the Company expanded its line of credit from $5.0 million to $20.0 million and extended the term by one year to mature on March 10, 2017. On November 21, 2016, the Company amended the agreement to extend the maturity date to November 21, 2018 and increase the borrowing capacity of the line of credit (Revolving Line) to $40.0 million. The available amount, not to exceed $40.0 million, is based on certain revenue metrics and is reduced by letters of credit totaling $4.2 million as of January 31, 2018 established in connection with facility lease agreements. As of January 31, 2018, $35.8 million was available under the Revolving Line.

Proceeds from loans made under the Revolving Line may be borrowed, repaid and reborrowed until November 21, 2018. Repayment of any outstanding proceeds are payable on November 21, 2018, but may be prepaid without penalty. Borrowings under the Revolving Line bear interest at an annual rate based on the one-year Prime rate plus a spread of 0.75%. Interest is payable quarterly. The Company is required to pay a quarterly facility fee to SVB of 0.15% per annum on the average undrawn portion available under the facility plus balances of outstanding letters of credits. Additionally, the Company is required to pay an upfront, one-time, commitment fee of $0.1 million and annual anniversary fees of $0.1 million on the amendment’s first and second anniversary dates.

As of January 31, 2018 and 2017, no amounts had been drawn under the Revolving Line and the Company was in compliance with all covenants pursuant to the loan and security agreement.

As part of the initial loan agreement, upon closing, the Company granted SVB a warrant to purchase 187,500 shares of common stock at $1.40 per share, with a potential to acquire up to an additional 112,500 shares of common stock at the same price, which right would be triggered upon future amounts drawn under the loan agreement. No additional amounts were drawn under the credit facility and as such, the conditional warrant to acquire up to an additional 112,500 shares was not issued. The fair value of the common stock warrant at the time of issuance was recorded as debt issuance costs. Upon exercise of the warrant in March 2017 in conjunction with the IPO, 168,750 shares were issued and 18,750 shares were withheld by the Company in lieu of cash exercise.