Stockholders’ Equity (Deficit)	12 Months Ended
Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Stockholders’ Equity (Deficit)	Stockholders’ Equity (Deficit) At the June 29, 2017 Special Meeting, the Company’s stockholders approved the amendment and restatement of the Company’s Certificate of Incorporation to increase the maximum number of shares of the Company’s stock authorized up to 260,000,000 shares of stock consisting of 250,000,000 shares of common stock and 10,000,000 shares of preferred stock. Previously the Company’s Certificate of Incorporation authorized up to 165,000,000 shares of capital stock, consisting of 155,000,000 shares of common stock and 10,000,000 shares of preferred stock. Preferred Stock The Certificate of Incorporation of the Company authorizes 10,000,000 shares of preferred stock, $.01 par value per share. The preferred stock may be issued from time to time in one or more series, with such distinctive serial designations, rights and preferences as shall be determined by the Board of Directors. On May 10, 2017, the Company issued in a private placement 1,000,000 shares (the “Preferred Shares”) of the Company’s Series A-1 Convertible Preferred Stock at a price of $125 per share for gross proceeds to the Company of $125.0 million, before deducting fees and expenses (the “Financing”). Each Preferred Share will be convertible into 23.10536 shares of common stock (or an aggregate of 23,105,348 shares of common stock). The conversion price per share of common stock is $5.41. For fiscal year ended June 30, 2018 the Company had no preferred stock outstanding. Following the June 29, 2017 Special Meeting and filing the Charter Amendment with the State of Delaware, the Company had authorized a sufficient number of unreserved shares of common stock to permit the exchange of the Preferred Shares. On July 31, 2017, the Company filed a registration statement on Form S-3 to register for resale the 23,105,348 shares of the Company's common stock issuable upon the exchange of the Series A-1 Convertible Preferred Stock. The Preferred Shares converted to shares of common stock on August 24, 2017. The registration statement was declared effective on September 19, 2017. Common Stock During June 2018, the Company announced that it had closed on a public offering of 13,225,000 shares of the Company's common stock. Refer to "Note 1 - Business Overview" for additional information. On February 10, 2017, in connection with the execution of a License Agreement, the Company entered into the Securities Purchase Agreement (“SPA”) with Seattle Genetics. Under the SPA, Seattle Genetics purchased 3,000,000 shares (the “Common Shares”) of the Company’s common stock at a price of $4.90 per share, for aggregate proceeds of $14.7 million. Concurrently with the sale of the Common Shares, pursuant to the SPA, the Company also agreed to issue the three-year warrant to purchase an aggregate of 8,655,804 shares of common stock. On July 31, 2017, the Company filed a registration statement on Form S-3 to register the 3,000,000 shares of Company’s common stock and 8,655,804 shares of common stock issuable upon the exercise of the warrants (in addition to the shares issuable upon the conversion of our Series A-1 Convertible Preferred Stock, as discussed above). The warrant became exercisable for cash on February 16, 2017 and expired on January 31, 2018. The warrant was issued on February 16, 2017 and was originally exercisable until February 10, 2020. On the date of issuance, the fair value of these warrants was determined to be $22.3 million. The difference between such fair value and the proceeds of $14.7 million has been recognized as an expense and presented in the consolidated statement operations as a “warrant related expense.” On May 4, 2017, the Company and Seattle Genetics entered into the Termination Agreement, pursuant to which the Company and Seattle Genetics relinquished their respective rights under the License Agreement and agreed to amend the terms of the warrant to amend the expiration date from February 10, 2020 to December 31, 2017. On December 5, 2017, Seattle Genetics exercised the Warrants they held in full to acquire 8,655,804 shares of Common Stock for an aggregate purchase price of $42.4 million. On October 11, 2016, the Company completed an underwritten public offering of 10 million shares of its common stock and accompanying warrants to purchase 10 million shares of common stock at a purchase price of $3.00 per unit, comprising of one share of common stock and one warrant. The Company received gross and net proceeds of $30.0 million and approximately $28.6 million, respectively after deducting the underwriting discounts and commissions and estimated expenses related to the offering payable. The warrants became exercisable nine months following the date of issuance and will expire on the second anniversary of the date of issuance and have an exercise price of $3.75. On the date of issuance, the fair value of these warrants was determined to be $7.3 million and recognized as a liability. The warrants under certain situations require cash settlement by the Company. During fiscal 2018 there were 9,550,000 warrants were exercised. The fair value of the 9,550,000 exercised warrants increased $102.1 million from June 30, 2017 to the dates of exercise which has been recognized in the accompanying consolidated statements of comprehensive loss. As of June 30, 2018 there were 450,000 warrants outstanding.

Stockholders’ Equity (Deficit)

At the June 29, 2017 Special Meeting, the Company’s stockholders approved the amendment and restatement of the Company’s Certificate of Incorporation to increase the maximum number of shares of the Company’s stock authorized up to 260,000,000 shares of stock consisting of 250,000,000 shares of common stock and 10,000,000 shares of preferred stock. Previously the Company’s Certificate of Incorporation authorized up to 165,000,000 shares of capital stock, consisting of 155,000,000 shares of common stock and 10,000,000 shares of preferred stock.

Preferred Stock

The Certificate of Incorporation of the Company authorizes 10,000,000 shares of preferred stock, $.01 par value per share. The preferred stock may be issued from time to time in one or more series, with such distinctive serial designations, rights and preferences as shall be determined by the Board of Directors.

On May 10, 2017, the Company issued in a private placement 1,000,000 shares (the “Preferred Shares”) of the Company’s Series A-1 Convertible Preferred Stock at a price of $125 per share for gross proceeds to the Company of $125.0 million, before deducting fees and expenses (the “Financing”). Each Preferred Share will be convertible into 23.10536 shares of common stock (or an aggregate of 23,105,348 shares of common stock). The conversion price per share of common stock is $5.41. For fiscal year ended June 30, 2018 the Company had no preferred stock outstanding.

Following the June 29, 2017 Special Meeting and filing the Charter Amendment with the State of Delaware, the Company had authorized a sufficient number of unreserved shares of common stock to permit the exchange of the Preferred Shares. On July 31, 2017, the Company filed a registration statement on Form S-3 to register for resale the 23,105,348 shares of the Company's common stock issuable upon the exchange of the Series A-1 Convertible Preferred Stock. The Preferred Shares converted to shares of common stock on August 24, 2017. The registration statement was declared effective on September 19, 2017.

Common Stock

During June 2018, the Company announced that it had closed on a public offering of 13,225,000 shares of the Company's common stock. Refer to "Note 1 - Business Overview" for additional information.

On February 10, 2017, in connection with the execution of a License Agreement, the Company entered into the Securities Purchase Agreement (“SPA”) with Seattle Genetics. Under the SPA, Seattle Genetics purchased 3,000,000 shares (the “Common Shares”) of the Company’s common stock at a price of $4.90 per share, for aggregate proceeds of $14.7 million. Concurrently with the sale of the Common Shares, pursuant to the SPA, the Company also agreed to issue the three-year warrant to purchase an aggregate of 8,655,804 shares of common stock. On July 31, 2017, the Company filed a registration statement on Form S-3 to register the 3,000,000 shares of Company’s common stock and 8,655,804 shares of common stock issuable upon the exercise of the warrants (in addition to the shares issuable upon the conversion of our Series A-1 Convertible Preferred Stock, as discussed above). The warrant became exercisable for cash on February 16, 2017 and expired on January 31, 2018. The warrant was issued on February 16, 2017 and was originally exercisable until February 10, 2020. On the date of issuance, the fair value of these warrants was determined to be $22.3 million. The difference between such fair value and the proceeds of $14.7 million has been recognized as an expense and presented in the consolidated statement operations as a “warrant related expense.” On May 4, 2017, the Company and Seattle Genetics entered into the Termination Agreement, pursuant to which the Company and Seattle Genetics relinquished their respective rights under the License Agreement and agreed to amend the terms of the warrant to amend the expiration date from February 10, 2020 to December 31, 2017. On December 5, 2017, Seattle Genetics exercised the Warrants they held in full to acquire 8,655,804 shares of Common Stock for an aggregate purchase price of $42.4 million.

On October 11, 2016, the Company completed an underwritten public offering of 10 million shares of its common stock and accompanying warrants to purchase 10 million shares of common stock at a purchase price of $3.00 per unit, comprising of one share of common stock and one warrant. The Company received gross and net proceeds of $30.0 million and approximately $28.6 million, respectively after deducting the underwriting discounts and commissions and estimated expenses related to the offering payable. The warrants became exercisable nine months following the date of issuance and will expire on the second anniversary of the date of issuance and have an exercise price of $3.75. On the date of issuance, the fair value of these warrants was determined to be $7.3 million and recognized as a liability. The warrants under certain situations require cash settlement by the Company. During fiscal 2018 there were 9,550,000 warrants were exercised. The fair value of the 9,550,000 exercised warrants increased $102.1 million from June 30, 2017 to the dates of exercise which has been recognized in the accompanying consolidated statements of comprehensive loss. As of June 30, 2018 there were 450,000 warrants outstanding.