Debt	6 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]
Debt	Debt Senior Secured Term Loans On December 19, 2014, the Company entered into a second amendment to its Loan and Security Agreement with Hercules (the “Hercules Second Amendment”) and entered into a new term loan, borrowing an additional $1.5 million (the “Term Loan C”). After closing fees and expenses, the net proceeds to the Company for the Term Loan C were $1.4 million. The Company made interest only payments at an interest rate of 11% through March 16, 2017 when the interest rate was increased to 11.25%, until maturity on June 1, 2017, when Term Loan C was repaid in its entirety. Hercules received warrants to purchase 13,927 shares of common stock (the “First Warrant”) and 25,641 shares of common stock (the “Second Warrant”) in conjunction with prior term loans that have been repaid in full. Due to certain adjustment provisions within the warrants, they qualified for liability accounting. The fair value of the warrants, $0.4 million and $0.2 million, respectively, was recorded upon issuance to debt discount and a warrant liability. In conjunction with the Hercules Second Amendment, the First Warrant and Second Warrant were canceled and replaced with the issuance of a new warrant (the “Hercules Warrant”) to purchase 58,823 shares of common stock at an exercise price of $7.85 per share, subject to certain price-based and other anti-dilution adjustments. The Hercules Warrant expires on June 30, 2020. See Note 12, “Warrants and Derivative Liabilities”, for a discussion on the Hercules Warrant and the valuation assumptions used. Interest expense on the Term Loans for the three months ended September 30, 2017 and 2016, was less than $0.1 million. Included in both periods was less than $0.1 million of non-cash interest expense related to the amortization of the debt discount on the respective Term Loans. Interest expense on the Term Loans for the six months ended September 30, 2017 and 2016, was less than $0.1 million and $0.3 million, respectively. Included in both periods was less than $0.1 million of non-cash interest expense related to the amortization of debt discount on the respective Term Loans.

Debt

Senior Secured Term Loans

On December 19, 2014, the Company entered into a second amendment to its Loan and Security Agreement with Hercules (the “Hercules Second Amendment”) and entered into a new term loan, borrowing an additional $1.5 million (the “Term Loan C”). After closing fees and expenses, the net proceeds to the Company for the Term Loan C were $1.4 million. The Company made interest only payments at an interest rate of 11% through March 16, 2017 when the interest rate was increased to 11.25%, until maturity on June 1, 2017, when Term Loan C was repaid in its entirety.

Hercules received warrants to purchase 13,927 shares of common stock (the “First Warrant”) and 25,641 shares of common stock (the “Second Warrant”) in conjunction with prior term loans that have been repaid in full. Due to certain adjustment provisions within the warrants, they qualified for liability accounting. The fair value of the warrants, $0.4 million and $0.2 million, respectively, was recorded upon issuance to debt discount and a warrant liability. In conjunction with the Hercules Second Amendment, the First Warrant and Second Warrant were canceled and replaced with the issuance of a new warrant (the “Hercules Warrant”) to purchase 58,823 shares of common stock at an exercise price of $7.85 per share, subject to certain price-based and other anti-dilution adjustments. The Hercules Warrant expires on June 30, 2020. See Note 12, “Warrants and Derivative Liabilities”, for a discussion on the Hercules Warrant and the valuation assumptions used.

Interest expense on the Term Loans for the three months ended September 30, 2017 and 2016, was less than $0.1 million. Included in both periods was less than $0.1 million of non-cash interest expense related to the amortization of the debt discount on the respective Term Loans. Interest expense on the Term Loans for the six months ended September 30, 2017 and 2016, was less than $0.1 million and $0.3 million, respectively. Included in both periods was less than $0.1 million of non-cash interest expense related to the amortization of debt discount on the respective Term Loans.