Debt	12 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt Senior Secured Term Loans On December 19, 2014, the Company entered into a second amendment 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 the loan 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 Warrant and the valuation assumptions used. Interest expense for the fiscal years ended March 31, 2018, 2017 and 2016, was less than $0.1 million, $0.4 million and $1.0 million, respectively, which included less than $0.1 million, $0.2 million and $0.4 million, respectively, of non-cash interest expense related to the amortization of the debt discount and payment of the Note in Company common stock at a discount.

Debt

Senior Secured Term Loans

On December 19, 2014, the Company entered into a second amendment 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 the loan 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 Warrant and the valuation assumptions used.

Interest expense for the fiscal years ended March 31, 2018, 2017 and 2016, was less than $0.1 million, $0.4 million and $1.0 million, respectively, which included less than $0.1 million, $0.2 million and $0.4 million, respectively, of non-cash interest expense related to the amortization of the debt discount and payment of the Note in Company common stock at a discount.