Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Textual (Details)

v3.21.1
Commitments and Contingencies - Textual (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Apr. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Mar. 31, 2021
USD ($)
ft²
numberOfRenewalOption
reportingUnit
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Apr. 30, 2020
ft²
Jan. 31, 2020
ft²
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²       77,300        
Number of options to extend | numberOfRenewalOption       1        
Asset retirement obligations       $ 200,000   $ 200,000    
Accretion expense related to asset retirement obligation       0 $ 0      
Capital lease obligations incurred   $ 300,000 $ 400,000          
Term of contract   3 years 3 years          
Indemnification Agreement [Member]                
Commitments and Contingencies [Line Items]                
Loss contingency accrual       0        
Credit Availability Concentration Risk [Member]                
Commitments and Contingencies [Line Items]                
Concentration risk, percentage 80.00%              
Term Loan [Member]                
Commitments and Contingencies [Line Items]                
Borrowing capacity $ 10,000,000.0              
Stated interest rate 3.75%              
Basis spread on variable rate (percent) 0.50%              
Revolving Credit Facility [Member]                
Commitments and Contingencies [Line Items]                
Borrowing capacity $ 5,000,000.0              
Stated interest rate 4.25%              
Basis spread on variable rate (percent) 1.00%              
Demand Deposits [Member]                
Commitments and Contingencies [Line Items]                
Non-current restricted cash       $ 1,100,000   $ 1,100,000    
200-220 Penobscot [Member]                
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²       28,200        
400 Penobscot [Member]                
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²       37,900        
Renewal term       5 years        
501 Chesapeake [Member]                
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²       11,200        
Number of options to extend | numberOfRenewalOption       1        
Renewal term       5 years        
101 Saginaw [Member]                
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²               29,900
Sublease [Member]                
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²             3,400 26,500
San Carlos [Member]                
Commitments and Contingencies [Line Items]                
Area of real estate property (in square feet) | ft²       36,593        
Number of options to extend | reportingUnit       1        
Annualized rent       $ 2,500,000        
Annual rent increases (as a percent)       3.00%        
Lease term       10 years        
Renewal term       5 years        
San Carlos [Member] | Leaseholds and Leasehold Improvements [Member]                
Commitments and Contingencies [Line Items]                
Tenant improvement allowance       $ 6,300,000        
San Carlos [Member] | Asset under Construction [Member]                
Commitments and Contingencies [Line Items]                
Tenant improvement allowance       2,700,000        
Annualized rent       $ 400,000