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Debt Facilities - Senior Credit Facility - Additional Information (Details) - USD ($)
Aug. 17, 2018
Mar. 05, 2018
Mar. 31, 2019
Line Of Credit Facility [Line Items]      
Term loan and equipment advance outstanding amount     $ 23,417,000
Equipment Term Loan Facility      
Line Of Credit Facility [Line Items]      
Amount of outstanding borrowings   $ 1,100,000  
General Corporate Purposes      
Line Of Credit Facility [Line Items]      
Amount available for borrowings   11,000,000  
Term Loan      
Line Of Credit Facility [Line Items]      
Term loan   $ 20,000,000  
Line of credit facility, amortization period   36 months  
Line of credit facility, mature date   Mar. 01, 2022  
Amount of outstanding borrowings   $ 7,900,000  
Term Loan | Term Loan Prepaid On or Before March 5, 2019      
Line Of Credit Facility [Line Items]      
Percentage of prepayment fee   2.00%  
Term Loan | Term Loan Prepaid After March 5, 2019, But On or Before March 5, 2020      
Line Of Credit Facility [Line Items]      
Percentage of prepayment fee   1.00%  
Line of Credit | Silicon Valley Bank      
Line Of Credit Facility [Line Items]      
Unamortized debt issuance costs     86,000
Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 25,000,000  
Amount of outstanding borrowings     0
Letter of Credit      
Line Of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   5,000,000  
Term Loan      
Line Of Credit Facility [Line Items]      
Term loan incurred   $ 9,000,000  
Term Loan | Line of Credit | Silicon Valley Bank      
Line Of Credit Facility [Line Items]      
Term loan and equipment advance outstanding amount     $ 20,000,000
Interest rate     6.25%
Equipment Term Loan Facility | Line of Credit      
Line Of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity $ 4,000,000    
Line of credit facility, amortization period 48 months    
Line of credit facility, mature date Aug. 01, 2022    
Line of credit facility, beginning date Sep. 01, 2018    
Equipment Term Loan Facility | Line of Credit | Silicon Valley Bank      
Line Of Credit Facility [Line Items]      
Term loan and equipment advance outstanding amount     $ 3,400,000
Interest rate     6.75%
Equipment Term Loan Facility | Line of Credit | Term Loan Prepaid On or Before August 17, 2019      
Line Of Credit Facility [Line Items]      
Percentage of prepayment fee 2.00%    
Equipment Term Loan Facility | Line of Credit | Term Loan Prepaid After August 17, 2019, but on or before August 17, 2020      
Line Of Credit Facility [Line Items]      
Percentage of prepayment fee 1.00%    
Term Loan and Equipment Loan | Minimum | LIBOR Rate      
Line Of Credit Facility [Line Items]      
Line of credit facility, basis rate 2.75%    
Term Loan and Equipment Loan | Minimum | Prime Rate      
Line Of Credit Facility [Line Items]      
Line of credit facility, basis rate 0.00%    
Term Loan and Equipment Loan | Maximum | LIBOR Rate      
Line Of Credit Facility [Line Items]      
Line of credit facility, basis rate 4.00%    
Term Loan and Equipment Loan | Maximum | Prime Rate      
Line Of Credit Facility [Line Items]      
Line of credit facility, basis rate 1.25%