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Stockholders' Equity
 6 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Stockholders' Equity

12. Stockholders’ Equity

On November 15, 2013, the Company entered into an ATM arrangement, pursuant to which, the Company was able to, at its discretion, sell up to $30.0 million of the Company’s common stock through its sales agent, MLV, & Co. LLC (“MLV”).   Sales of common stock made under the ATM were made on The Nasdaq Global Select Market under the Company’s previously filed and currently effective Registration Statement on Form S-3 (File No. 333-191153) by means of ordinary brokers’ transactions at market prices. Additionally, under the terms of the ATM, the Company was also able to sell shares of its common stock through MLV, on The Nasdaq Global Select Market or otherwise, at negotiated prices or at prices related to the prevailing market price. The Company paid MLV a commission of up to 3% of the gross proceeds from the sale of shares of its common stock under the ATM.  The Company also agreed to provide MLV with customary indemnification rights.

During the six months ended September 30, 2014, the Company received net proceeds of $4.9 million, including sales commissions and offering expenses, from sales of approximately 290,741 shares of its common stock at an average sales price of approximately $17.16 per share under the ATM.  On November 5, 2014, the Company terminated its ATM arrangement with MLV.  

On November 13, 2014, the Company completed an equity offering to Hudson Bay Capital, under which the Company sold approximately 909,090 units of its common stock at $11.00 per share.  Each unit consisted of one share of common stock and 0.9 of a warrant to purchase one share of common stock, or a warrant to purchase approximately 818,181 shares of common stock.  (See Note 11, “Warrants and Derivative Liabilities”, for further information regarding the warrant).  After underwriting, commissions and expenses, the Company received net proceeds from the offering of approximately $9.1 million.  The Company allocated the net proceeds first to the fair value of the warrants as determined under a lattice model on November 13, 2014 (See Note 11, “Warrants and Derivative Liabilities,” for a discussion on both warrants and the valuation assumptions used) with the residual fair value allocated to the common stock. Costs of the offering were allocated to other (expense) income and equity based on the relative fair value of the warrants and common stock, respectively.

On April 29, 2015, the Company completed an equity offering with Cowen and Company, LLC, under which the Company sold 4.0 million shares of its common stock at an offering price of $6.00 per share.  After underwriting, commissions and expenses, the Company received net proceeds from the offering of approximately $22.3 million.