Casi Holdings and Evomela Supply Contract	3 Months Ended
Mar. 31, 2019
Other Commitments [Abstract]
Casi Holdings and Evomela Supply Contract	CASI HOLDINGS AND EVOMELA SUPPLY CONTRACT Overview of CASI Transaction In 2014, we executed three perpetual out-license agreements for our former products ZEVALIN, MARQIBO, and EVOMELA (“CASI Out-Licensed Products”) with CASI, a publicly-traded biopharmaceutical company (NASDAQ: CASI) with a primary focus on the China market (collectively, the “CASI Out-License”). Under the CASI Out-License, we received CASI common stock and a secured promissory note and CASI gained the exclusive rights to distribute the CASI Out-Licensed Products in greater China (which includes Taiwan, Hong Kong and Macau). On March 1, 2019, we completed the Commercial Product Portfolio Transaction and substantially all of the contractual rights and obligations associated with the Commercial Product Portfolio, including the CASI Out-License, were transferred to Acrotech at closing. However, we will continue to supply CASI with EVOMELA under an active contract that tentatively was not assumed by Acrotech as part of our Commercial Product Portfolio Transaction (see Note 3(h)). After we fulfill this open order, Acrotech will then assume future supply of this product to CASI and we will not have any further involvement with the arrangement. Our Ownership in CASI at March 31, 2019 Under certain conditions that expired in December 2017, we exercised our rights during 2016 and 2017 to purchase additional shares of CASI common stock at par value in order to maintain our post-investment ownership percentage. Our aggregate holding of 11.5 million CASI common shares as of March 31, 2019 represented an approximate 12.1% ownership with a fair market value of $33.1 million (see Note 3(a)). In April 2019, we completed the sale of 1.5 million of these shares under a forward-sales contract (see Note 3(c)).

CASI HOLDINGS AND EVOMELA SUPPLY CONTRACT

Overview of CASI Transaction

In 2014, we executed three perpetual out-license agreements for our former products ZEVALIN, MARQIBO, and EVOMELA (“CASI Out-Licensed Products”) with CASI, a publicly-traded biopharmaceutical company (NASDAQ: CASI) with a primary focus on the China market (collectively, the “CASI Out-License”). Under the CASI Out-License, we received CASI common stock and a secured promissory note and CASI gained the exclusive rights to distribute the CASI Out-Licensed Products in greater China (which includes Taiwan, Hong Kong and Macau). On March 1, 2019, we completed the Commercial Product Portfolio Transaction and substantially all of the contractual rights and obligations associated with the Commercial Product Portfolio, including the CASI Out-License, were transferred to Acrotech at closing. However, we will continue to supply CASI with EVOMELA under an active contract that tentatively was not assumed by Acrotech as part of our Commercial Product Portfolio Transaction (see Note 3(h)). After we fulfill this open order, Acrotech will then assume future supply of this product to CASI and we will not have any further involvement with the arrangement.

Our Ownership in CASI at March 31, 2019

Under certain conditions that expired in December 2017, we exercised our rights during 2016 and 2017 to purchase additional shares of CASI common stock at par value in order to maintain our post-investment ownership percentage. Our aggregate holding of 11.5 million CASI common shares as of March 31, 2019 represented an approximate 12.1% ownership with a fair market value of $33.1 million (see Note 3(a)). In April 2019, we completed the sale of 1.5 million of these shares under a forward-sales contract (see Note 3(c)).