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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive gain (loss)
Balance (in shares) at Dec. 31, 2019   112,131      
Balance at Dec. 31, 2019 $ 975,373 $ 112 $ 1,261,142 $ (285,789) $ (92)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) (28,416)     (28,416)  
Foreign currency translation adjustment 8       8
Unrealized gain (loss) on marketable securities, net of tax (48)       (48)
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   1,792      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan (702) $ 2 (704)    
Stock-based compensation 19,613   19,613    
Balance (in shares) at Sep. 30, 2020   113,923      
Balance at Sep. 30, 2020 965,828 $ 114 1,280,051 (314,205) (132)
Balance (in shares) at Jun. 30, 2020   113,744      
Balance at Jun. 30, 2020 972,730 $ 114 1,274,136 (301,468) (52)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) (12,737)     (12,737)  
Foreign currency translation adjustment 6       6
Unrealized gain (loss) on marketable securities, net of tax (86)       (86)
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   179      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan (919)   (919)    
Stock-based compensation 6,834   6,834    
Balance (in shares) at Sep. 30, 2020   113,923      
Balance at Sep. 30, 2020 965,828 $ 114 1,280,051 (314,205) (132)
Balance (in shares) at Dec. 31, 2020   111,698      
Balance at Dec. 31, 2020 912,706 $ 112 1,270,426 (357,751) (81)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) 12,229     12,229  
Foreign currency translation adjustment (234)       (234)
Unrealized gain (loss) on marketable securities, net of tax (85)       (85)
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   1,382      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan (4,951) $ 1 (4,952)    
Stock Issued During Period, Shares, Acquisitions   300      
Stock Issued During Period, Value, Acquisitions 6,978   6,978    
Repurchase and retirement of common stock under repurchase program   (4,015)      
Repurchase and retirement of common stock under repurchase program (100,081) $ (4) (22,862) (77,215)  
Stock-based compensation 21,281   21,281    
Balance (in shares) at Sep. 30, 2021   109,365      
Balance at Sep. 30, 2021 847,843 $ 109 1,270,871 (422,737) (400)
Balance (in shares) at Jun. 30, 2021   108,897      
Balance at Jun. 30, 2021 830,588 $ 109 1,257,075 (426,413) (183)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) 3,676     3,676  
Foreign currency translation adjustment (217)       (217)
Unrealized gain (loss) on marketable securities, net of tax 0        
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   168      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan (651)   (651)    
Stock Issued During Period, Shares, Acquisitions   300      
Stock Issued During Period, Value, Acquisitions 6,978   6,978    
Repurchase and retirement of common stock under repurchase program   0      
Repurchase and retirement of common stock under repurchase program (13)   (13)    
Stock-based compensation 7,482   7,482    
Balance (in shares) at Sep. 30, 2021   109,365      
Balance at Sep. 30, 2021 $ 847,843 $ 109 $ 1,270,871 $ (422,737) $ (400)