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Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 03, 2017
May 09, 2016
Jan. 01, 2015
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsidiary, Sale of Stock [Line Items]              
Treasury stock (in shares)       0 0 0  
Shares withheld for tax purposes and retired (in shares)         65,952 18,229  
Period for recognition         3 years 4 months 24 days    
Total compensation cost attributable to shares awarded       $ 1,800,000 $ 2,800,000   $ 1,200,000
Nonvested awards, compensation costs not yet recognized       $ 1,600,000 $ 1,600,000    
Shares issued in acquisition of business (in shares)         1,882,058    
Share consideration given for Tealstone acquisition (1,882,058 shares)         $ 17,061,000 $ 0 0
Net proceeds from stock issued         $ 0 $ 19,142,000 $ 0
Restricted Stock              
Subsidiary, Sale of Stock [Line Items]              
Grants in the period (in shares)         217,341 79,240 978,526
Grants in the period (USD per share)         $ 10.69 $ 4.36 $ 4.53
Total compensation cost attributable to shares awarded         $ 353,000 $ 250,000 $ 250,000
Vested (in shares)         612,463 351,855 166,622
Restricted Stock | Minimum              
Subsidiary, Sale of Stock [Line Items]              
Period for recognition         2 years    
Restricted Stock | Maximum              
Subsidiary, Sale of Stock [Line Items]              
Period for recognition         4 years    
Restricted Stock | Key Employees              
Subsidiary, Sale of Stock [Line Items]              
Grants in the period (in shares)         180,542 20,000 917,851
Grants in the period (USD per share)         $ 10.92 $ 4.78 $ 4.55
Plan 2001              
Subsidiary, Sale of Stock [Line Items]              
Weighted average remaining contractual term         10 years    
Number of shares authorized for grant (in shares)       1,900,000 1,900,000    
Number of shares available for grant (in shares)       400,289 400,289    
Long-term Incentive Plan              
Subsidiary, Sale of Stock [Line Items]              
Percentage of incentive plan based on service completion     50.00%        
Requisite service period     3 years        
Percentage of incentive plan based on shareholder return     50.00%        
Incentive plan term for shareholder return     3 years        
Shares issued during the period, net of forfeitures (in shares)           86,483  
Total compensation cost attributable to shares awarded           $ 1,200,000  
Vested (in shares)         47,947    
Forfeited in the period (in shares)         0 29,781 24,738
Long-term Incentive Plan | Performance Shares              
Subsidiary, Sale of Stock [Line Items]              
Vested (in shares)         15,982    
D.A. Davidson and Co.              
Subsidiary, Sale of Stock [Line Items]              
Stock issued in equity offering, net of expense (in shares)   5,175,000          
Share price (USD per share)   $ 4          
Share price, net (USD per share)   $ 3.77          
Net proceeds from stock issued   $ 19,100,000          
Tealstone              
Subsidiary, Sale of Stock [Line Items]              
Shares issued in acquisition of business (in shares) 1,882,058            
Share consideration given for Tealstone acquisition (1,882,058 shares) $ 17,061,000            
Warrants to the Lenders Under the Loan Agreement              
Subsidiary, Sale of Stock [Line Items]              
Share price (USD per share) $ 8.88            
Warrants value $ 3,500,000     $ 3,500,000 $ 3,500,000    
Warrants to the Lenders Under the Loan Agreement | Loan and Security Agreement              
Subsidiary, Sale of Stock [Line Items]              
Warrants, term 5 years            
Number of shares issued if warrants are called (in shars) 1,000,000            
Warrant exercise price (USD per share) $ 10.25