Annual report pursuant to Section 13 and 15(d)

Income Tax - Additional Information (Detail)

v3.10.0.1
Income Tax - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
Income Tax Contingency [Line Items]  
Tax Cuts and Jobs Act of 2017 Accounting Complete true
Tax credit carry forward expiration period 2033
Operating loss carryforwards, limitations on use Stock ownership of one or more 5% shareholders (shareholders owning 5% or more of the Company’s outstanding capital stock) has increased on a cumulative basis by more than 50 percentage points.
Domestic Tax Authority [Member]  
Income Tax Contingency [Line Items]  
Operating loss carryforwards $ 130,590,000
Deferred tax assets, tax credit carryforwards, research $ 3,669,000
Tax credit research and development expiration period 2032
State and Local Jurisdiction [Member]  
Income Tax Contingency [Line Items]  
Operating loss carryforwards $ 131,084,000
Deferred tax assets, tax credit carryforwards, research $ 2,944,000