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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 09, 2020
USD ($)
Apr. 22, 2020
USD ($)
May 31, 2022
USD ($)
day
$ / shares
$ / item
shares
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
day
$ / shares
$ / item
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jun. 01, 2022
USD ($)
May 24, 2022
$ / shares
Dec. 31, 2021
USD ($)
Mar. 04, 2021
$ / shares
Debt Instrument [Line Items]                          
Purchase of capped call               $ 31,671,000 $ 16,134,000        
Common Stock                          
Debt Instrument [Line Items]                          
Stock price (in USD per share) | $ / shares                     $ 41.31    
Convertible Senior Notes Due 2026                          
Debt Instrument [Line Items]                          
Convertible debt, conversion ratio         0.0301427                
Stock price (in USD per share) | $ / shares                         $ 26.02
Cap price (in USD per per share) | $ / item         45.535                
Premium over stock price (percent)         75.00%                
Capped-call transaction term, consecutive trading days | day         40                
Purchase of capped call         $ 16,100,000                
Convertible Senior Notes Due 2026 | Common Stock                          
Debt Instrument [Line Items]                          
Conversion price (in dollars per share) | $ / shares         $ 33.18                
Convertible Senior Notes Due 2028                          
Debt Instrument [Line Items]                          
Convertible debt, conversion ratio     0.018986                    
Stock price (in USD per share) | $ / shares                         $ 41.31
Cap price (in USD per per share) | $ / item     82.62                    
Premium over stock price (percent)     100.00%                    
Capped-call transaction term, consecutive trading days | day     40                    
Purchase of capped call     $ 32,000,000.0                    
Convertible Senior Notes Due 2028 | Common Stock                          
Debt Instrument [Line Items]                          
Conversion price (in dollars per share) | $ / shares     $ 52.67                    
Loan and Security Agreement | Silicon Valley Bank | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Interest rate 5.00%                        
Debt instrument term 4 years                        
Maximum borrowing capacity $ 30,000,000                        
Qualifying accounts receivable 80.00%                        
Commitment fee amount $ 300,000                        
Anniversary fee amount 300,000                        
Quarterly minimum revenue $ 90,000,000                        
Loan and Security Agreement | Silicon Valley Bank | Revolving Credit Facility | Prime Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable rate 1.75%                        
PPP Loan                          
Debt Instrument [Line Items]                          
Interest rate   1.00%                      
Loan proceeds   $ 7,200,000                      
Gain (loss) on extinguishment of debt       $ 7,200,000       0 7,185,000        
Convertible notes                          
Debt Instrument [Line Items]                          
Carrying amount           $ 300,256,000   300,256,000       $ 134,243,000  
Amortization of debt issuance costs           400,000   900,000          
Interest expense including amortization of debt issuance costs           2,100,000 $ 1,000,000.0 4,600,000 2,200,000        
Gain (loss) on extinguishment of debt           0 $ 0 (34,423,000) $ 0        
Convertible notes | Convertible Senior Notes Due 2026                          
Debt Instrument [Line Items]                          
Notes issued         $ 138,300,000                
Interest rate     2.25%   2.25%                
Proceeds from convertible notes, net of unamortized debt issuance costs         $ 133,600,000                
Cash exchanged     $ 45,776,000                    
Payment of accrued interest     300,000                    
Extinguishment of debt     $ 69,125,000                    
Shares issued in debt conversion (in shares) | shares     1,354,348                    
Carrying amount           67,458,000   $ 67,458,000   $ 69,100,000   134,243,000  
Redemption threshold percentage of stock price trigger         130.00%                
Redemption threshold trading days | day         20                
Redemption threshold consecutive trading days | day         30                
Redemption price, percentage         100.00%                
Required outstanding amount not subject to redemption         $ 50,000,000                
Portion of 2026 Note principal exchanged     $ 1,824,000                    
Effective interest rate during period               2.98%          
Gain (loss) on extinguishment of debt     34,423,000                    
Convertible notes | Convertible Senior Notes Due 2026 | Occurrence of Fundamental Change                          
Debt Instrument [Line Items]                          
Redemption price, percentage         100.00%                
Incremental repurchase amount         $ 1,000                
Convertible notes | Convertible Senior Notes Due 2026 | Level 2                          
Debt Instrument [Line Items]                          
Convertible debt at fair value           186,200,000   $ 186,200,000          
Convertible notes | Convertible Senior Notes Due 2026, First Conversion Trigger                          
Debt Instrument [Line Items]                          
Conversion threshold trading days | day         20                
Threshold Consecutive trading days | day         30                
Conversion threshold percentage of stock price trigger         130.00%                
Convertible notes | Convertible Senior Notes Due 2026, Second Conversion Trigger                          
Debt Instrument [Line Items]                          
Conversion threshold trading days | day         5                
Threshold Consecutive trading days | day         5                
Conversion threshold percentage of stock price trigger         98.00%                
Convertible notes | Convertible Senior Notes Due 2028                          
Debt Instrument [Line Items]                          
Notes issued     $ 240,000,000                    
Interest rate     2.25%                    
Proceeds from convertible notes, net of unamortized debt issuance costs     $ 232,400,000                    
Additional principal     $ 10,000,000                    
Carrying amount           232,798,000   $ 232,798,000       $ 0  
Redemption threshold percentage of stock price trigger     130.00%                    
Redemption threshold trading days | day     20                    
Redemption threshold consecutive trading days | day     30                    
Redemption price, percentage     100.00%                    
Required outstanding amount not subject to redemption     $ 100,000,000                    
Effective interest rate during period               2.82%          
Convertible notes | Convertible Senior Notes Due 2028 | Occurrence of Fundamental Change                          
Debt Instrument [Line Items]                          
Redemption price, percentage     100.00%                    
Incremental repurchase amount     $ 1,000                    
Convertible notes | Convertible Senior Notes Due 2028 | Voce Capital Management LLC                          
Debt Instrument [Line Items]                          
Notes issued     $ 230,000,000                    
Convertible notes | Convertible Senior Notes Due 2028 | Level 2                          
Debt Instrument [Line Items]                          
Convertible debt at fair value           $ 246,000,000.0   $ 246,000,000.0          
Convertible notes | Convertible Senior Notes Due 2028, First Conversion Trigger                          
Debt Instrument [Line Items]                          
Conversion threshold trading days | day     20                    
Threshold Consecutive trading days | day     30                    
Redemption threshold percentage of stock price trigger     130.00%                    
Convertible notes | Convertible Senior Notes Due 2028, Second Conversion Trigger                          
Debt Instrument [Line Items]                          
Conversion threshold trading days | day     5                    
Threshold Consecutive trading days | day     5                    
Conversion threshold percentage of stock price trigger     98.00%