Debt	6 Months Ended
Jul. 31, 2016
Debt Disclosure [Abstract]
Debt	Note 7. Debt Line of Credit In August 2013, we entered into a two-year $100.0 million secured revolving credit facility (August 2013 Facility). The August 2013 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to the London Interbank Offer Rate (LIBOR) plus 3.0% or the Alternate Base Rate (ABR) plus 2.0%. In addition, there is a commitment fee of 0.5% on outstanding unused commitment amount. At closing, we drew $34.0 million at 3.4% (six month LIBOR plus 3.0%) which we used to repay the outstanding Hercules loans and the related early payoff and end of term fees, as well as for other general corporate purposes. In July 2014, we drew an additional $12.0 million under the credit facility at 3.3% (six month LIBOR plus 3.0%). In September 2014, we paid down $6.0 million and amended the credit facility to reduce our borrowing capacity from $100.0 million to $75.0 million and extend the facility through August 2016. Concurrently and in conjunction with the execution of our new headquarters lease in September 2014, letters of credit in the aggregate amount of $25.0 million were issued under the credit facility. These letters of credit reduce our total borrowing capacity under the credit facility and are subject to interest at 3.25% per annum. As of January 31, 2015, the outstanding borrowings under the credit facility were $40 million and our remaining borrowing capacity under the credit facility was $10.0 million. In March 2015, we amended the August 2013 Facility to reduce our borrowing capacity to $60.0 million as of April 2015, and to increase certain limitations on the amount of capital asset and real estate related obligations we may incur. In connection with this amendment, the letters of credit under the August 2013 Facility were cancelled, and a new letter of credit in the amount of $25.0 million was issued by a party not affiliated with the August 2013 Facility, which was secured by a certificate of deposit in the same amount. Borrowings under the August 2013 Facility were collateralized by substantially all of our assets. The August 2013 Facility also contained various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, material adverse effects, as well as limitations on dispositions, mergers or consolidations and other corporate activities. In December 2015, we paid in full all amounts outstanding under the August 2013 Facility, including the outstanding principal balance of $40.0 million, and terminated the August 2013 Facility and all related loan documents and collateral documents, in conjunction with entering into a new revolving credit facility with a different lender (December 2015 Facility). The December 2015 Facility provides for a revolving loan facility in the amount of up to $40.0 million maturing in December 2017. The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%. Although no minimum deposit is required for the December 2015 Facility, we are eligible for the lowest interest rate if we maintain at least $40 million in deposits with the lender. In addition, there is an annual fee of 0.2% on the total commitment amount. At closing, we drew $40.0 million at 1.82% (six month LIBOR plus 1.25%) which we used repay the outstanding principal balance under the August 2013 Facility. Borrowings under the December 2015 Facility are collateralized by substantially all of our assets in the United States. It also contains various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, as well as customary limitations on dispositions, mergers or consolidations and other corporate activities. As of July 31, 2016, we were in compliance with all financial covenants. In connection with the above credit facilities, we incurred interest expense, net of capitalized interest costs, of $0.2 million and $$0.4 million during the three months ended July 31, 2016 and 2015, respectively, and $0.4 million and $1.1 million during the six months ended July 31, 2016 and 2015, respectively. Interest expense also includes amortization of issuance costs, unused commitment fees and fees on letters of credit which are recognized over the related term of the borrowing.

Note 7. Debt

Line of Credit

In August 2013, we entered into a two-year $100.0 million secured revolving credit facility (August 2013 Facility). The August 2013 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to the London Interbank Offer Rate (LIBOR) plus 3.0% or the Alternate Base Rate (ABR) plus 2.0%. In addition, there is a commitment fee of 0.5% on outstanding unused commitment amount. At closing, we drew $34.0 million at 3.4% (six month LIBOR plus 3.0%) which we used to repay the outstanding Hercules loans and the related early payoff and end of term fees, as well as for other general corporate purposes. In July 2014, we drew an additional $12.0 million under the credit facility at 3.3% (six month LIBOR plus 3.0%). In September 2014, we paid down $6.0 million and amended the credit facility to reduce our borrowing capacity from $100.0 million to $75.0 million and extend the facility through August 2016. Concurrently and in conjunction with the execution of our new headquarters lease in September 2014, letters of credit in the aggregate amount of $25.0 million were issued under the credit facility. These letters of credit reduce our total borrowing capacity under the credit facility and are subject to interest at 3.25% per annum. As of January 31, 2015, the outstanding borrowings under the credit facility were $40 million and our remaining borrowing capacity under the credit facility was $10.0 million.

In March 2015, we amended the August 2013 Facility to reduce our borrowing capacity to $60.0 million as of April 2015, and to increase certain limitations on the amount of capital asset and real estate related obligations we may incur. In connection with this amendment, the letters of credit under the August 2013 Facility were cancelled, and a new letter of credit in the amount of $25.0 million was issued by a party not affiliated with the August 2013 Facility, which was secured by a certificate of deposit in the same amount.

Borrowings under the August 2013 Facility were collateralized by substantially all of our assets. The August 2013 Facility also contained various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, material adverse effects, as well as limitations on dispositions, mergers or consolidations and other corporate activities.

In December 2015, we paid in full all amounts outstanding under the August 2013 Facility, including the outstanding principal balance of $40.0 million, and terminated the August 2013 Facility and all related loan documents and collateral documents, in conjunction with entering into a new revolving credit facility with a different lender (December 2015 Facility). The December 2015 Facility provides for a revolving loan facility in the amount of up to $40.0 million maturing in December 2017.

The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%. Although no minimum deposit is required for the December 2015 Facility, we are eligible for the lowest interest rate if we maintain at least $40 million in deposits with the lender. In addition, there is an annual fee of 0.2% on the total commitment amount. At closing, we drew $40.0 million at 1.82% (six month LIBOR plus 1.25%) which we used repay the outstanding principal balance under the August 2013 Facility. Borrowings under the December 2015 Facility are collateralized by substantially all of our assets in the United States. It also contains various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, as well as customary limitations on dispositions, mergers or consolidations and other corporate activities. As of July 31, 2016, we were in compliance with all financial covenants.

In connection with the above credit facilities, we incurred interest expense, net of capitalized interest costs, of $0.2 million and $$0.4 million during the three months ended July 31, 2016 and 2015, respectively, and $0.4 million and $1.1 million during the six months ended July 31, 2016 and 2015, respectively. Interest expense also includes amortization of issuance costs, unused commitment fees and fees on letters of credit which are recognized over the related term of the borrowing.