Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Schedule of Share-based Compensation Rollforward (Details)

v3.19.1
Stock-Based Compensation Schedule of Share-based Compensation Rollforward (Details) - 2007 and 1992 Stock Incentive Plans - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding, beginning of year (in shares) 1,288 1,508 1,813
Number of options granted 758 165 374
Options exercised (in shares) 0 0 0
Options canceled (in shares) (604) (385) (679)
Options outstanding, end of year (in shares) 1,442 1,288 1,508
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, weighted-average exercise price, beginning of year (dollars per share) $ 6.18 $ 7.03 $ 10.00
Options granted, weighted-average exercise price (dollars per share) 2.24 2.16 2.86
Options exercised, weighted-average exercise price (dollars per share) 0.00 0.00 0.00
Options canceled, weighted-average exercise price (dollars per share) 7.60 7.81 12.66
Options outstanding, weighted-average exercise price, end of year (dollars per share) $ 3.51 $ 6.18 $ 7.03
Weighted-average remaining contractual term for options outstanding (In years) 4 years 321 days    
Aggregate intrinsic value of options outstanding (value) $ 0    
Options subject to exercise (in shares) 572 838 703
Weighted-average exercise price for options subject to exercise (dollars per share) $ 5.29 $ 7.85 $ 10.06
Weighted-average remaining contractual term for options subject to exercise 2 years 347 days    
Aggregate intrinsic value for options subject to exercise (value) $ 0    
Options vested and expected to vest (in shares) 1,442    
Weighted-average exercise price for options vested and expected to vest (dollars per share) $ 3.51    
Weighted-average remaining contractual term for options vested and expected to vest (In years) 4 years 321 days    
Aggregate intrinsic value of options vested and expected to vest (value) $ 0