Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.19.1
Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Related Party Transaction [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.50%  
Annual Management Services Agreement Fee Income Expense Written Off $ 1.0    
Opus Credit Facility [Member]      
Related Party Transaction [Line Items]      
Payments of Loan Costs   $ 0.3 $ 0.3
Debt Instrument, Interest Rate, Stated Percentage [1]   12.00%  
Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Interest own in percent by principal stockholder or director   15.30%  
TG Therapeutics, Inc [Member]      
Related Party Transaction [Line Items]      
Payments for Rent   $ 0.3  
OPPM [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current   $ 0.1  
Executives Vice Chairman [Member]      
Related Party Transaction [Line Items]      
Interest own in percent by principal stockholder or director   14.90%  
Desk Share Agreements [Member]      
Related Party Transaction [Line Items]      
Payments for Rent   $ 0.7  
Desk Share Agreements [Member] | TG Therapeutics, Inc [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current   0.4  
Desk Share Agreements [Member] | OPPM [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current   0.4  
Shared Services Agreement [Member] | TG Therapeutics, Inc [Member]      
Related Party Transaction [Line Items]      
Proceeds from Related Party Agreement   0.1 $ 0.3
Due from Related Parties, Current   $ 0.1  
[1] Classified as short-term on the Company’s Consolidated Balance Sheet as of December 31, 2018.