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Equity - Statement of Stockholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period $ 411,026 $ 421,798 $ 437,775 $ 593,930 $ 827,957 $ 840,093 $ 437,775 $ 840,093
Net loss (11,767) (15,565) (18,530) (8,953) (237,634) (15,827) (45,862) (262,414)
Other comprehensive income, net of tax (42) 20 38   (24) 24    
Share-based compensation expense 3,783 4,588 3,157 3,279 4,904 4,537    
Net issuance under employee stock plans (530) 185 (642) (169) (408) (426)    
Purchases of common stock       (10,000) (865) (444)    
Balance at the end of the period 402,470 411,026 421,798 578,087 593,930 827,957 402,470 578,087
Common Stock                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period $ 490 $ 487 $ 485 $ 487 $ 487 $ 482 $ 485 $ 482
Balance (in shares) 48,971 48,675 48,547 48,734 48,691 48,229 48,547 48,229
Net issuance under employee stock plans $ (1) $ 3 $ 2 $ (1)   $ 5    
Net issuance under employee stock plans (in shares) (68) 296 128 (101) 43 462    
Balance at the end of the period $ 489 $ 490 $ 487 $ 486 $ 487 $ 487 $ 489 $ 486
Balance (in shares) 48,903 48,971 48,675 48,633 48,734 48,691 48,903 48,633
Treasury Stock                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period     $ (5,872)     $ (1,284) $ (5,872) $ (1,284)
Balance (in shares)     523     85 523 85
Net issuance under employee stock plans     $ 5,872 $ 340 $ 865 $ 1,728    
Net issuance under employee stock plans (in shares)     (523) (23) (57) (115)    
Purchases of common stock       $ (10,000) $ (865) $ (444)    
Purchase of common stock (in shares)       863 57 30    
Balance at the end of the period       $ (9,660)       $ (9,660)
Balance (in shares)       840       840
Additional Paid-in Capital                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period $ 1,062,949 $ 1,058,179 $ 1,061,325 $ 1,057,962 $ 1,054,331 $ 1,051,953 $ 1,061,325 $ 1,051,953
Share-based compensation expense 3,783 4,588 3,157 3,279 4,904 4,537    
Net issuance under employee stock plans (529) 182 (6,303) (508) (1,273) (2,159)    
Balance at the end of the period 1,066,203 1,062,949 1,058,179 1,060,733 1,057,962 1,054,331 1,066,203 1,060,733
Accumulated Deficit                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period (654,291) (638,726) (619,983) (466,331) (228,697) (212,870) (619,983) (212,870)
Net loss (11,767) (15,565) (18,530) (8,953) (237,634) (15,827)    
Net issuance under employee stock plans     (213)          
Balance at the end of the period (666,058) (654,291) (638,726) (475,284) (466,331) (228,697) (666,058) (475,284)
Accumulated Other Comprehensive Income                
Increase (Decrease) in Stockholders' Equity                
Balance at the beginning of the period 1,878 1,858 1,820 1,812 1,836 1,812 1,820 1,812
Other comprehensive income, net of tax (42) 20 38   (24) 24    
Balance at the end of the period $ 1,836 $ 1,878 $ 1,858 $ 1,812 $ 1,812 $ 1,836 $ 1,836 $ 1,812