Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v3.20.4
Income Taxes - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Operating Loss Carryforwards [Line Items]  
Unrecognized tax benefits $ 0
US  
Operating Loss Carryforwards [Line Items]  
Federal and State Net Operating Loss Carryforwards 135,000,000
Japan  
Operating Loss Carryforwards [Line Items]  
Federal and State Net Operating Loss Carryforwards 1,500,000
Federal and state tax credit carry-forwards 3,800,000
State  
Operating Loss Carryforwards [Line Items]  
Federal and State Net Operating Loss Carryforwards $ 5,400,000