XML 34 R24.htm IDEA: XBRL DOCUMENT v3.21.2
Formation and Business of the Company - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2020
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Formation and Business of the Company [Line Items]                    
Net loss   $ (50,075) $ (21,590) $ (29,561) $ (9,985) $ (41,063) $ (24,888) $ (101,226) $ (75,936) $ (83,100)
Net cash provided by/(used in operating activities)               (26,722) (10,668) 1,200
Accumulated deficit   $ 594,059           $ 594,059   $ 492,833
Common stock in underwriting public offering 1,868,750                  
Net proceeds from common stock $ 147,100               $ 147,144  
1.75% Convertible Senior Notes due 2021 [Member]                    
Formation and Business of the Company [Line Items]                    
Debt instrument due year               2021   2021
2.75% Convertible Senior Notes due 2025 [Member]                    
Formation and Business of the Company [Line Items]                    
Debt instrument due year               2025   2025
Aggregate principal amount of convertible senior notes 189,800                  
Net proceeds from the debt offering after deducting transaction costs $ 183,600