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Equity - Statement of Stockholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period $ 395,331 $ 377,064 $ 374,512 $ 411,026 $ 421,798 $ 437,775 $ 374,512 $ 437,775
Net income (loss) 580 (8,302) (567) (11,767) (15,565) (18,530) (8,290) (45,862)
Other comprehensive income (loss), net of tax (60) (130) 153 (42) 20 38    
Share-based compensation expense 2,942 2,974 3,646 3,783 4,588 3,157    
Net issuance under employee stock plans (700) 755 (680) (530) 185 (642)    
Extinguishment of equity component of repurchased 2023 Notes   (80)            
Equity component of 2027 Notes   33,363            
Purchase of capped calls   (10,313)            
Balance at the end of the period 398,093 395,331 377,064 402,470 411,026 421,798 398,093 402,470
Common Stock                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period $ 496 $ 494 $ 490 $ 490 $ 487 $ 485 $ 490 $ 485
Balance (in shares) 49,619 49,428 48,994 48,971 48,675 48,547 48,994 48,547
Net issuance under employee stock plans   $ 2 $ 4 $ (1) $ 3 $ 2    
Net issuance under employee stock plans (in shares) (7) 191 434 (68) 296 128    
Balance at the end of the period $ 496 $ 496 $ 494 $ 489 $ 490 $ 487 $ 496 $ 489
Balance (in shares) 49,612 49,619 49,428 48,903 48,971 48,675 49,612 48,903
Treasury Stock                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period           $ (5,872)   $ (5,872)
Balance (in shares)           523   523
Net issuance under employee stock plans           $ 5,872    
Net issuance under employee stock plans (in shares)           (523)    
Additional Paid-in Capital                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period $ 1,100,717 $ 1,074,020 $ 1,071,058 $ 1,062,949 $ 1,058,179 $ 1,061,325 $ 1,071,058 $ 1,061,325
Share-based compensation expense 2,942 2,974 3,646 3,783 4,588 3,157    
Net issuance under employee stock plans (700) 753 (684) (529) 182 (6,303)    
Extinguishment of equity component of repurchased 2023 Notes   (80)            
Equity component of 2027 Notes   33,363            
Purchase of capped calls   (10,313)            
Balance at the end of the period 1,102,959 1,100,717 1,074,020 1,066,203 1,062,949 1,058,179 1,102,959 1,066,203
Accumulated Deficit                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period (707,799) (699,497) (698,930) (654,291) (638,726) (619,983) (698,930) (619,983)
Net income (loss) 580 (8,302) (567) (11,767) (15,565) (18,530)    
Net issuance under employee stock plans           (213)    
Balance at the end of the period (707,219) (707,799) (699,497) (666,058) (654,291) (638,726) (707,219) (666,058)
Accumulated Other Comprehensive Income                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period 1,917 2,047 1,894 1,878 1,858 1,820 1,894 1,820
Other comprehensive income (loss), net of tax (60) (130) 153 (42) 20 38    
Balance at the end of the period $ 1,857 $ 1,917 $ 2,047 $ 1,836 $ 1,878 $ 1,858 $ 1,857 $ 1,836