Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Textual (Details)

v3.19.3
Commitments and Contingencies - Textual (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Jun. 30, 2017
USD ($)
Apr. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Sep. 30, 2019
USD ($)
ft²
building
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
building
Sep. 30, 2018
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
USD ($)
Jul. 31, 2019
USD ($)
Feb. 28, 2019
Jan. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2017
multiplier
Dec. 31, 2016
Commitments and Contingencies [Line Items]                                
Area of real estate property (in sq. ft.) | ft²       107,200   107,200                    
Number of buildings leased | building       4   4                    
Incentive from lessor       $ 0   $ 0               $ 500,000    
Asset retirement obligations       200,000   200,000               200,000    
Accretion expense related to asset retirement obligation       0 $ 0 0 $ 0                  
Rent expense       1,100,000 800,000 3,400,000 2,400,000                  
Operating lease, sublease rentals       200,000 $ 300,000 700,000 $ 900,000                  
Capital lease obligations incurred   $ 300,000 $ 400,000                          
Term of contract   3 years 3 years                         3 years
Right-of-use assets, operating leases, net       24,542,000   24,542,000               0    
Operating lease, liability       26,447,000   26,447,000               0    
Right-of-use assets - finance leases, net       321,000   321,000             $ 500,000 0    
Finance lease, liability       122,000   122,000             300,000 0    
Indemnification Agreement [Member]                                
Commitments and Contingencies [Line Items]                                
Loss contingency accrual       0   0                    
Term Loan [Member]                                
Commitments and Contingencies [Line Items]                                
Borrowing capacity $ 10,000,000.0                              
Term Loan [Member] | LIBOR [Member]                                
Commitments and Contingencies [Line Items]                                
Basis spread on variable rate 3.60%                              
Revolving Credit Facility [Member]                                
Commitments and Contingencies [Line Items]                                
Borrowing capacity $ 5,000,000.0                              
Accounts receivable borrowing base percentage 80.00%                              
Stated interest rate 5.00%                              
Minimum cash multiplier | multiplier                             6  
Revolving Credit Facility [Member] | Prime Rate [Member]                                
Commitments and Contingencies [Line Items]                                
Basis spread on variable rate 1.00%                              
Letter of Credit [Member]                                
Commitments and Contingencies [Line Items]                                
Maximum borrowing capacity                   $ 700,000   $ 1,100,000        
Accounting Standards Update 2016-02 [Member]                                
Commitments and Contingencies [Line Items]                                
Right-of-use assets, operating leases, net                         26,617,000      
Operating lease, liability                         27,562,000      
Right-of-use assets - finance leases, net                         493,000      
Finance lease, liability                         $ 302,000      
Demand Deposits [Member]                                
Commitments and Contingencies [Line Items]                                
Non-current restricted cash       $ 1,100,000   $ 1,100,000               $ 700,000    
Eighth Lease Amendment [Member]                                
Commitments and Contingencies [Line Items]                                
Renewal term                     88 months          
Payments for capital improvements               $ 3,600,000                
Tenant reimbursements                 $ 3,100,000              
Redwood City, California, Penobscot Space [Member]                                
Commitments and Contingencies [Line Items]                                
Area of real estate property (in sq. ft.) | ft²       28,200   28,200                    
Redwood City, California, Building 2 Space [Member]                                
Commitments and Contingencies [Line Items]                                
Area of real estate property (in sq. ft.) | ft²       37,900   37,900                    
Redwood City, California, 501 Chesapeake Space [Member]                                
Commitments and Contingencies [Line Items]                                
Area of real estate property (in sq. ft.) | ft²       11,200   11,200                    
Redwood City, California, Saginaw Space [Member]                                
Commitments and Contingencies [Line Items]                                
Area of real estate property (in sq. ft.) | ft²       29,900   29,900