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Stock-Based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
$ 0.96 - $6.58    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options (in shares) 707,500  
Weighted- Average Remaining Contractual Life (in years) 6 years 11 months  
Weighted- Average Exercise Price (in dollars per share) $ 3.02  
Number of Options (in shares) 707,500  
Weighted- Average Exercise Price (in dollars per share) $ 3.02  
$ 0.96 - $6.58 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   $ 0.96
$ 0.96 - $6.58 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   6.58
$ 6.59 - $11.59    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options (in shares) 319,250  
Weighted- Average Remaining Contractual Life (in years) 1 year 7 months  
Weighted- Average Exercise Price (in dollars per share) $ 9.68  
Number of Options (in shares) 319,250  
Weighted- Average Exercise Price (in dollars per share) $ 9.68  
$ 6.59 - $11.59 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   6.59
$ 6.59 - $11.59 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   11.59
$11.60 - $16.60    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options (in shares) 20,000  
Weighted- Average Remaining Contractual Life (in years) 7 months  
Weighted- Average Exercise Price (in dollars per share) $ 15.42  
Number of Options (in shares) 20,000  
Weighted- Average Exercise Price (in dollars per share) $ 15.42  
$11.60 - $16.60 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   11.60
$11.60 - $16.60 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   16.60
$16.61 - $21.70    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options (in shares) 15,000  
Weighted- Average Remaining Contractual Life (in years) 2 months  
Weighted- Average Exercise Price (in dollars per share) $ 17.82  
Number of Options (in shares) 15,000  
Weighted- Average Exercise Price (in dollars per share) $ 17.82  
$16.61 - $21.70 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   16.61
$16.61 - $21.70 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   21.70
$21.71 - $26.80    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options (in shares) 55,000  
Weighted- Average Remaining Contractual Life (in years) 5 months  
Weighted- Average Exercise Price (in dollars per share) $ 23.15  
Number of Options (in shares) 55,000  
Weighted- Average Exercise Price (in dollars per share) $ 23.15  
$21.71 - $26.80 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   21.71
$21.71 - $26.80 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   26.80
$ 0.96 - $26.80    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options (in shares) 1,116,750  
Weighted- Average Remaining Contractual Life (in years) 4 years 9 months  
Weighted- Average Exercise Price (in dollars per share) $ 6.34  
Number of Options (in shares) 1,116,750  
Weighted- Average Exercise Price (in dollars per share) $ 6.34  
$ 0.96 - $26.80 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   0.96
$ 0.96 - $26.80 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices (in dollars per share)   $ 26.80