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Accounts Payable and Accrued Liabilities
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities:
The following table represents the components of accounts payable and accrued liabilities as of December 31:
20192018
Accounts payable$11,704  $3,166  
Accrued rebates28,528  12,261  
Accrued compensation and benefits5,545  3,814  
Accrued acquisition costs—  318  
Accrued returns4,438  715  
Accrued royalties535  159  
Accrued clinical trial costs—  464  
Accrued regulatory fees331  —  
Accrued legal1,484  70  
Accrued other1,428  572  
Total accounts payable and accrued expenses$53,993  $21,539  
As of December 31, 2019, three vendors comprised 61% of the accounts payable balance. As of December 31, 2018, three vendors comprised 37% of the accounts payable balance.