Registration of securities issued in business combination transactions

Commitments and Contingencies - Summary of Contractual Obligations (Detail)

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Commitments and Contingencies - Summary of Contractual Obligations (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]    
Total $ 400 $ 492
Less than 1 year 353  
Less than 1 year   372
1-3 years 33 107
3-5 years 9 9
More than 5 years 5 4
Bothell Office Operating Lease [Member]    
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]    
Total 309 376
Less than 1 year 285  
Less than 1 year   281
1-3 years 24 95
Vancouver Office Operating Lease [Member]    
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]    
Total 46 68
Less than 1 year 46  
Less than 1 year   68
UBC License Maintenance Fees [Member]    
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]    
Total 28 26
Less than 1 year 5  
Less than 1 year   4
1-3 years 9 9
3-5 years 9 9
More than 5 years 5 4
Leased Equipment [Member]    
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]    
Total 17 22
Less than 1 year $ 17  
Less than 1 year   19
1-3 years   $ 3