Teva Agreement	9 Months Ended
Jan. 31, 2017
Research and Development [Abstract]
Teva Agreement	Teva Agreement On July 30, 2013, the Company entered into an agreement with Teva Pharmaceutical Industries Ltd. (“Teva”), pursuant to which the Company agreed to conduct TumorGraft studies on multiple proprietary chemical compounds provided by Teva to determine the activity or response of these compounds in potential clinical indications. Under the agreement, Teva agreed to pay an upfront payment and, under certain conditions, pay the Company various amounts upon achieving certain milestones, based on the performance of the compounds in preclinical testing and dependent upon testing the compound in clinical settings and obtaining FDA approval. In addition, Teva agreed to pay the Company royalties on any commercialized products developed under the agreement. This agreement terminated a prior collaborative agreement between Cephalon, Inc., a wholly-owned subsidiary of Teva, and the Company. Revenue recognized related to this agreement for the nine months ended January 31, 2017 and 2016, was $42,000 and $48,000, respectively. This agreement has been terminated and all work relating to the upfront payment has been completed.

Teva Agreement

9 Months Ended

Jan. 31, 2017

On July 30, 2013, the Company entered into an agreement with Teva Pharmaceutical Industries Ltd. (“Teva”), pursuant to which the Company agreed to conduct TumorGraft studies on multiple proprietary chemical compounds provided by Teva to determine the activity or response of these compounds in potential clinical indications. Under the agreement, Teva agreed to pay an upfront payment and, under certain conditions, pay the Company various amounts upon achieving certain milestones, based on the performance of the compounds in preclinical testing and dependent upon testing the compound in clinical settings and obtaining FDA approval. In addition, Teva agreed to pay the Company royalties on any commercialized products developed under the agreement. This agreement terminated a prior collaborative agreement between Cephalon, Inc., a wholly-owned subsidiary of Teva, and the Company. Revenue recognized related to this agreement for the nine months ended January 31, 2017 and 2016, was $42,000 and $48,000, respectively. This agreement has been terminated and all work relating to the upfront payment has been completed.