Quarterly report pursuant to Section 13 or 15(d)

11. Commitments (Tables)

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11. Commitments (Tables)
3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Supplemental cash flow information
    Three Months Ended March 31,  
    2019  
Operating cash flow information:        
Cash paid for amounts included in the measurement of lease liabilities   $ 3,977  
Non-cash activity:        
Right-of-use assets obtained in exchange for lease obligations   $ 43,330  
Supplemental balance sheet information
    Balance Sheet Classification   March 31, 2019  
Right-of-use assets   Other assets   $ 39,353  
Current lease liabilities   Accrued expenses and other current liabilities   $ 26,234  
Non-current lease liabilities   Other liabilities   $ 13,119