Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plan (Narrative) (Details)

v3.8.0.1
Stock-Based Compensation Plan (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
item
shares
Mar. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum number of shares of common stock that may be granted through awards to any employee in any calendar year 500  
Allocated Share-based Compensation Expense | $ $ 499 $ 33
Unrecognized compensation cost related to unvested stock options | $ $ 5,251  
Unvested restricted stock awards 850  
Unvested stock options 1,857  
Unrecognized compensation cost related to unvested restricted stock awards | $ $ 1,110  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock options issued under a plan 1,500  
Shares issued 1,500  
Number of Vesting Tranches | item 5  
Stock options granted fair value | $ $ 4,480