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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - $ / shares
 3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Number of Shares        
Options granted (in shares) 0      
Amended and Restated 2010 Equity Incentive Plan [Member]        
Shares Available for Grant        
Balance at the beginning of the year (in shares) 392,000 183,000    
Additional shares authorized     50,000  
Balance at the end of the year (in shares) 81,000 392,000 183,000  
Number of Shares        
Balance at the beginning of the period (in shares) 336,000 508,000    
Balance at the end of the period (in shares) 248,000 336,000 508,000  
Weighted Average Exercise Prices        
Weighted-average exercise price (in dollars per share) $ 16.47 $ 16.04 $ 14.06  
RSU's | Amended and Restated 2010 Equity Incentive Plan [Member]        
Shares Available for Grant        
Restricted stock units granted (in shares) (407,000)      
Restricted stock units cancelled and returned to Plan (in shares) 8,000 37,000 5,000  
Options | Amended and Restated 2010 Equity Incentive Plan [Member]        
Shares Available for Grant        
Balance at the beginning of the year (in shares)     114,000  
Options granted (in shares)     (1,000)  
Options cancelled and returned to Plan (in shares) 88,000 172,000 15,000  
Number of Shares        
Balance at the beginning of the period (in shares)     522,000  
Options granted (in shares)     1,000  
Options cancelled and returned to Plan (in shares) (88,000) (172,000) (15,000)  
Weighted Average Exercise Prices        
Weighted-average exercise price (in dollars per share)       $ 13.88
Options granted (in dollars per share)     $ 2.36  
Options cancelled and returned to Plan (in dollars per share) $ 14.83 $ 10.20 $ 6.94