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Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Quarter
shares
Jun. 30, 2016
USD ($)
Quarter
shares
Jun. 30, 2017
USD ($)
Quarter
shares
Jun. 30, 2016
USD ($)
Quarter
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 644,000 $ 241,000 $ 1,258,000 $ 488,000
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 6,000   $ 12,000  
Granted performance-based RSUs (in shares) | shares 0 0 0 160,000
Aggregate fair value for performance-based RSUs       $ 282,000
Granted time-based RSUs (in shares) | shares 172,875 5,000 396,677 134,824
Aggregate fair value for time-based RSUs $ 585,763 $ 13,350 $ 1,368,763 $ 299,350
Number of quarters RSU's will vest quarterly | Quarter 8 12 8 12
Period in which a portion of RSU's will vest after grant date 1 year   1 year  
Period in which RSU's will vest annually in equal amounts 3 years   3 years  
Restricted Stock Units [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period     1 year 1 year
Restricted Stock Units [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period     5 years 5 years
Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted under stock options (in shares) | shares 0 0 0 40,000
Fair value of shares granted under stock option plan       $ 46,000