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Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balances at Dec. 31, 2019 $ 216,352 $ 32 $ 626,401 $ (409,768) $ (313)
Beginning balances, shares at Dec. 31, 2019   31,544,361      
Exercise of common stock options 17,364   17,364    
Exercise of common stock options, shares   390,476      
Issuance of common stock upon release of restricted stock units   99,790      
Shares withheld for tax obligations (1,187)   (1,187)    
Shares withheld for tax obligations, shares   (11,055)      
Stock based compensation 8,483   8,483    
Net loss (24,888)     (24,888)  
Other comprehensive loss (1,044)       (1,044)
Ending balances at Mar. 31, 2020 215,080 $ 32 651,061 (434,656) (1,357)
Ending balances, shares at Mar. 31, 2020   32,023,572      
Beginning balances at Dec. 31, 2019 216,352 $ 32 626,401 (409,768) (313)
Beginning balances, shares at Dec. 31, 2019   31,544,361      
Net loss (75,936)        
Other comprehensive loss 362        
Ending balances at Sep. 30, 2020 379,780 $ 35 865,400 (485,704) 49
Ending balances, shares at Sep. 30, 2020   34,419,299      
Beginning balances at Dec. 31, 2019 216,352 $ 32 626,401 (409,768) (313)
Beginning balances, shares at Dec. 31, 2019   31,544,361      
Net loss (83,100)        
Ending balances at Dec. 31, 2020 388,460 $ 35 880,660 (492,833) 598
Ending balances, shares at Dec. 31, 2020   34,583,064      
Beginning balances at Mar. 31, 2020 215,080 $ 32 651,061 (434,656) (1,357)
Beginning balances, shares at Mar. 31, 2020   32,023,572      
Issuance of common stock upon underwritten public offering, net of issuance costs 147,144 $ 2 147,142    
Issuance of common stock upon underwritten public offering, net of issuance costs, shares   1,868,750      
Conversion feature of convertible senior notes due 2025, net of allocated costs 48,340   48,340    
Purchase of bond hedges (52,390)   (52,390)    
Sale of warrants 34,933   34,933    
Exercise of common stock options 8,357   8,357    
Exercise of common stock options, shares   196,024      
Issuance of common stock upon release of restricted stock units   146,105      
Shares withheld for tax obligations (1,551)   (1,551)    
Shares withheld for tax obligations, shares   (12,694)      
Issuance of common stock under employee stock purchase plan 4,690   4,690    
Issuance of common stock under employee stock purchase plan, shares   52,733      
Stock based compensation 10,087   10,087    
Net loss (41,063)     (41,063)  
Other comprehensive loss 801       801
Ending balances at Jun. 30, 2020 374,428 $ 34 850,669 (475,719) (556)
Ending balances, shares at Jun. 30, 2020   34,274,490      
Exercise of common stock options 3,202 $ 1 3,201    
Exercise of common stock options, shares   89,988      
Issuance of common stock upon release of restricted stock units   72,331      
Shares withheld for tax obligations (2,441)   (2,441)    
Shares withheld for tax obligations, shares   (17,510)      
Stock based compensation 13,971   13,971    
Net loss (9,985)     (9,985)  
Other comprehensive loss 605       605
Ending balances at Sep. 30, 2020 379,780 $ 35 865,400 (485,704) 49
Ending balances, shares at Sep. 30, 2020   34,419,299      
Beginning balances at Dec. 31, 2020 388,460 $ 35 880,660 (492,833) 598
Beginning balances, shares at Dec. 31, 2020   34,583,064      
Exercise of common stock options 1,331   1,331    
Exercise of common stock options, shares   28,152      
Issuance of common stock upon release of restricted stock units   99,389      
Shares withheld for tax obligations (2,801)   (2,801)    
Shares withheld for tax obligations, shares   (17,886)      
Stock based compensation 9,235   9,235    
Net loss (29,561)     (29,561)  
Other comprehensive loss (459)       (459)
Ending balances at Mar. 31, 2021 366,205 $ 35 888,425 (522,394) 139
Ending balances, shares at Mar. 31, 2021   34,692,719      
Beginning balances at Dec. 31, 2020 388,460 $ 35 880,660 (492,833) 598
Beginning balances, shares at Dec. 31, 2020   34,583,064      
Net loss (101,226)        
Other comprehensive loss (778)        
Ending balances at Sep. 30, 2021 319,202 $ 35 913,406 (594,059) (180)
Ending balances, shares at Sep. 30, 2021   34,898,631      
Beginning balances at Mar. 31, 2021 366,205 $ 35 888,425 (522,394) 139
Beginning balances, shares at Mar. 31, 2021   34,692,719      
Exercise of common stock options 305   305    
Exercise of common stock options, shares   5,998      
Issuance of common stock upon release of restricted stock units   133,609      
Shares withheld for tax obligations (2,314)   (2,314)    
Shares withheld for tax obligations, shares   (15,142)      
Issuance of common stock under employee stock purchase plan 4,648   4,648    
Issuance of common stock under employee stock purchase plan, shares   37,753      
Issuance of common stock from conversion of convertible senior notes due 2021   $ 1 (1)    
Issuance of common stock from conversion of convertible senior notes due 2021, shares   682,912      
Exercise of bond hedge for convertible senior notes due 2021   $ (1) 1    
Exercise of bond hedge for convertible senior notes due 2021, shares   (682,916)      
Stock based compensation 11,032   11,032    
Net loss (21,590)     (21,590)  
Other comprehensive loss 90       90
Ending balances at Jun. 30, 2021 358,376 $ 35 902,096 (543,984) 229
Ending balances, shares at Jun. 30, 2021   34,854,933      
Exercise of common stock options 51   51    
Exercise of common stock options, shares   1,773      
Issuance of common stock upon release of restricted stock units   52,611      
Shares withheld for tax obligations (1,375)   (1,375)    
Shares withheld for tax obligations, shares   (10,686)      
Stock based compensation 12,634   12,634    
Net loss (50,075)     (50,075)  
Other comprehensive loss (409)       (409)
Ending balances at Sep. 30, 2021 $ 319,202 $ 35 $ 913,406 $ (594,059) $ (180)
Ending balances, shares at Sep. 30, 2021   34,898,631