Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Lease expiration date		May 31, 2020
Right-of-use lease asset, net	$ 1,499	$ 1,828
Net lease liabilities	$ 1,589
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease terms	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease terms	8 years
Seattle, Washington [Member]
Lessee Lease Description [Line Items]
Operating lease terms		87 months
Operating lease rent starting date	May 01, 2020
Lease expiration date	Jul. 31, 2027
Right-of-use lease asset, net		$ 1,200
Net lease liabilities		$ 1,200