Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 12 Months Ended
Nov. 19, 2018
USD ($)
ft²
Dec. 11, 2017
ft²
Aug. 01, 2015
ft²
Feb. 28, 2015
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 01, 2018
USD ($)
Feb. 01, 2015
USD ($)
Other Commitments [Line Items]                  
Expiration of operating lease agreement         2019-01        
Consolidated rent and facilities expense         $ 300,000 $ 600,000 $ 900,000    
Indemnification obligations         0        
Expenses related to indemnification issues         $ 0        
Grosvenor International Limited [Member]                  
Other Commitments [Line Items]                  
Area of office space leased | ft²       11,526          
Expiration date of option to lease additional area of office space       Aug. 01, 2015          
Lease expiration date       Apr. 30, 2018 Mar. 31, 2018        
Optional lease renewal       3 years          
Monthly base rent commencement date       May 01, 2015          
Lessee's share of property tax percentage.       17.00%          
Construction allowance received for leasehold improvements                 $ 100,000
Deposit amount under lease agreement                 $ 200,000
Additional office space | ft²     2,245            
Grosvenor International Limited [Member] | Minimum [Member]                  
Other Commitments [Line Items]                  
Monthly base rent       $ 18,000          
Grosvenor International Limited [Member] | Maximum [Member]                  
Other Commitments [Line Items]                  
Monthly base rent       $ 20,000          
Pike [Member]                  
Other Commitments [Line Items]                  
Area of office space leased | ft²   3,187              
Lease agreement         On December 11, 2017, we entered into a lease, or New Lease, with 520 Pike Street, Inc., or Pike, pursuant to which we leased approximately 3,187 square feet located at Suite 2250 at 520 Pike Tower, Seattle, Washington, 98101, which commenced on March 1, 2018. The initial term of the New Lease will expire at the end of the month on the third anniversary of the New Lease.        
Monthly base rent               $ 11,685,000  
Monthly base rent, maximum annual increase               12,397,000  
Lease, security deposit, annual payment               37,192,000  
Lease, security deposit payment, annual decrease               $ 12,397,000  
Percentage of profit attributable to lessor         50.00%        
Percentage of property if subleased could result in lease termination         50.00%        
Vancouver, British Columbia [Member]                  
Other Commitments [Line Items]                  
Lease agreement commencement date Feb. 01, 2019                
Annual rent expense $ 100,000                
Area of office space leased | ft² 2,367                
Operating lease, term of contract 4 years