Leases - Schedule of Classification of ROU Assets and Lease liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2019
ASSETS
Operating right-of-use assets	$ 2,272	$ 2,696	$ 2,100
Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Finance right-of-use assets	$ 157	$ 234
Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Total lease assets	$ 2,429	$ 2,930
Current
Operating leases	$ 269	$ 282
Operating Lease Liability Current Statement Of Financial Position Extensible List	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Finance leases	$ 68	$ 77
Finance Lease Liability Current Statement Of Financial Position Extensible List	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Noncurrent
Operating leases	$ 3,949	$ 3,021
Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List	us-gaap:LiabilitiesNoncurrent	us-gaap:LiabilitiesNoncurrent
Finance leases	$ 96	$ 164
Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List	us-gaap:LiabilitiesNoncurrent	us-gaap:LiabilitiesNoncurrent
Total lease liabilities	$ 4,382	$ 3,544