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Equity Incentive Plans and Stock-Based Compensation (Details 2) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Compensation Plan      
Shares available for grant      
Shares available, at the beginning of the year 10,074,046 5,051,147 7,305,368
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 400,000 [1] 5,500,000  
Stock options granted (in shares) (80,000) (711,479) (558,426)
Options forfeited (in shares) 426,960 877,803 1,978,042
Nonvested equity stock and stock units granted (in shares) [3] (7,261,845) [2] (4,993,802) [4] (5,007,947) [5]
Nonvested equity stock and stock units forfeited (in shares) [3] 3,267,702 4,350,377 1,334,110
Shares available, at the end of the period 6,826,863 10,074,046 5,051,147
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards 1.5 1.5 1.5
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards 1.5 1.5 1.5
Potential additional performance stock units      
Shares available for grant      
Nonvested equity stock and stock units granted (in shares) 1,000,000.0 500,000 400,000
[1]
Shares were reserved under the 2019 Inducement Plan adopted in the third quarter of 2019.
[2]
Amount includes 1.0 million shares that have been reserved for potential future issuance related to certain performance unit awards discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
[3]
For purposes of determining the number of shares available for grant under the 2015 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.
[4]
Amount includes 0.5 million shares that have been reserved for potential future issuance related to certain performance unit awards discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
[5]
Amount includes 0.4 million shares that had been reserved for potential future issuance related to certain performance unit awards discussed under the section titled “Nonvested Equity Stock and Stock Units” below.