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Stock-Based Compensation - Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Number of Options Outstanding [Roll Forward]        
Granted (in shares)     60,000  
Options        
Number of Options Outstanding [Roll Forward]        
Options outstanding, beginning of period (in shares)     2,666,000  
Granted (in shares) 0 0 0  
Exercised (in shares)     (93,000)  
Canceled and expired (in shares)     (4,000)  
Options outstanding, end of period (in shares) 2,569,000   2,569,000 2,666,000
Options vested and unvested options expected to vest, net of forfeitures, end of period (in shares) 2,553,000   2,553,000  
Options exercisable, end of period (in shares) 1,862,000   1,862,000  
Weighted-average Exercise Price [Roll Forward]        
Options outstanding, beginning of period (in dollars per share)     $ 3.81  
Exercised (in dollars per share)     2.83  
Canceled and expired (in dollars per share)     5.21  
Options outstanding, end of period (in dollars per share) $ 3.84   3.84 $ 3.81
Options vested and unvested options expected to vest, net of forfeitures (in dollars per share) 3.82   3.82  
Options exercisable, end of period (in dollars per share) $ 3.41   3.41  
Weighted-average grant date fair value of stock options granted (in dollars per share)     $ 2.76  
Weighted average Remaining Contractual Life [Abstract]        
Options outstanding     6 years 2 months 9 days 6 years 10 months 13 days
Options vested and unvested options expected to vest, net of forfeitures, end of period     6 years 2 months 5 days  
Option exercisable, end of period     5 years 6 months 22 days  
Aggregate Intrinsic Value [Abstract]        
Options outstanding, beginning of period     $ 13,149  
Options outstanding, end of period $ 8,847   8,847 $ 13,149
Options vested and expected to vest, end of period 8,822   8,822  
Options exercisable, end of period $ 6,979   $ 6,979  
Closing price (in dollars per share) $ 7.15   $ 7.15