Annual report pursuant to Section 13 and 15(d)

Income Taxes - Net Operating Loss and Tax Credit Carryovers (Details)

v3.8.0.1
Income Taxes - Net Operating Loss and Tax Credit Carryovers (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Internal Revenue Service (IRS)  
Operating Loss Carryforwards [Line Items]  
Net operating loss $ 18,988
Net operating loss, expiration year Dec. 31, 2037
State and Local Jurisdiction  
Operating Loss Carryforwards [Line Items]  
Net operating loss $ 118,027
State and Local Jurisdiction | Minimum  
Operating Loss Carryforwards [Line Items]  
Net operating loss, expiration year Dec. 31, 2025
State and Local Jurisdiction | Maximum  
Operating Loss Carryforwards [Line Items]  
Net operating loss, expiration year Dec. 31, 2036