Annual report pursuant to Section 13 and 15(d)

Income Taxes (NOL) (Details)

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Income Taxes (NOL) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Operating Loss Carryforwards  
NOL, offset future federal taxable income $ 256,000
NOL, carried forward indefinitely 9,000
AMT credits 727
Federal  
Operating Loss Carryforwards  
NOL carryforwards 265,000
Federal | Research and development  
Operating Loss Carryforwards  
Tax credit carryforward 20,841
State  
Operating Loss Carryforwards  
NOL carryforwards 208,000
State | Alternative minimum  
Operating Loss Carryforwards  
Tax credit carryforward 19
State | Research and development  
Operating Loss Carryforwards  
Tax credit carryforward 10,785
Foreign  
Operating Loss Carryforwards  
Tax credit carryforward $ 1,253
Minimum  
Operating Loss Carryforwards  
AMT credits refundable 50.00%
Maximum  
Operating Loss Carryforwards  
AMT credits refundable 100.00%