Summary of Significant Accounting Policies and Use of Estimates - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2018
Accounting Policies [Abstract]
Cash and equivalents maturities period	3 months
FUSILEV, MARQIBO, and BELEODAQ [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of months after expiration customers are allowed to return products	6 months
EVOMELA [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of months after expiration customers are allowed to return products	12 months
Number of months prior to product expiration during which customer can return product	6 months
Subsequent Event [Member] | Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle on retained earnings		$ 4.7