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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) (15,679)     (15,679)  
Foreign currency translation adjustment 2       2
Unrealized gain (loss) on marketable securities, net of tax 38       38
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   1,613      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 217 $ 2 215    
Stock-based compensation 12,779   12,779    
Balance (in shares) at Jun. 30, 2020   113,744      
Balance at Jun. 30, 2020 972,730 $ 114 1,274,136 (301,468) (52)
Balance (in shares) at Mar. 31, 2020   113,275      
Balance at Mar. 31, 2020 971,597 $ 113 1,264,000 (292,328) (188)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) (9,140)     (9,140)  
Foreign currency translation adjustment 2       2
Unrealized gain (loss) on marketable securities, net of tax 134       134
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   469      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 3,430 $ 1 3,429    
Stock-based compensation 6,707   6,707    
Balance (in shares) at Jun. 30, 2020   113,744      
Balance at Jun. 30, 2020 972,730 $ 114 1,274,136 (301,468) (52)
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) 8,553     8,553  
Foreign currency translation adjustment (17)       (17)
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)   1,214      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan (4,300) $ 1 (4,301)    
Repurchase and retirement of common stock under repurchase program   (4,015)      
Repurchase and retirement of common stock under repurchase program (100,068) $ (4) (22,849) (77,215)  
Stock-based compensation 13,799   13,799    
Balance (in shares) at Jun. 30, 2021   108,897      
Balance at Jun. 30, 2021 830,588 $ 109 1,257,075 (426,413) (183)
Balance (in shares) at Mar. 31, 2021   112,505      
Balance at Mar. 31, 2021 909,406 $ 113 1,269,790 (360,364) (133)
Increase (Decrease) in Stockholders' Equity          
Net income (loss) 11,166     11,166  
Foreign currency translation adjustment 4       4
Unrealized gain (loss) on marketable securities, net of tax (54)       (54)
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   407      
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 2,836 $ 0 2,836    
Repurchase and retirement of common stock under repurchase program   (4,015)      
Repurchase and retirement of common stock under repurchase program (100,068) $ (4) (22,849) (77,215)  
Stock-based compensation 7,298   7,298    
Balance (in shares) at Jun. 30, 2021   108,897      
Balance at Jun. 30, 2021 $ 830,588 $ 109 $ 1,257,075 $ (426,413) $ (183)