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Stock-Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 25, 2016
May 29, 2010
Apr. 12, 2010
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Stock Based Compensation Details [Line Items]                
Common stock, shares outstanding (in shares)       53,391,948   53,391,948   53,148,441 [1]
Weighted-average grant-date fair value (in dollars per share)           $ 3.45 $ 3.41  
Unrecognized compensation costs       $ 3,600   $ 3,600    
Employee Stock Option                
Stock Based Compensation Details [Line Items]                
Number of Options Issued (in shares)           464,895    
Number of Options Forfeited (in shares)           68,585    
Shares of common stock options outstanding (in shares)       4,330,113   4,330,113   4,105,369
Restricted Stock                
Stock Based Compensation Details [Line Items]                
Unrecognized compensation costs       $ 1,300   $ 1,300    
Compensation expense       $ 245 $ 192 $ 468 $ 372  
Restricted Stock | Minimum                
Stock Based Compensation Details [Line Items]                
Vesting period           1 year    
Restricted Stock | Maximum                
Stock Based Compensation Details [Line Items]                
Vesting period           3 years    
Director Stock Option Plan - 1999                
Stock Based Compensation Details [Line Items]                
Shares approved and authorized (in shares)       1,975,000   1,975,000    
Number of Options Issued (in shares)           2,634,798    
Number of Options Forfeited (in shares)           807,782    
Vesting period           1 year    
Maximum term           10 years    
Shares of common stock options outstanding (in shares)       500,000   500,000    
Director Stock Option Plan - 1999 | Employee Stock Option                
Stock Based Compensation Details [Line Items]                
Shares available for grant (in shares)       147,984   147,984    
1999 Stock Incentive Plan                
Stock Based Compensation Details [Line Items]                
Shares approved and authorized (in shares)       3,200,000   3,200,000    
Number of Options Issued (in shares)           2,892,500    
Vesting period           4 years    
Maximum term           10 years    
FMV common stock options granted (as a percent)           100.00%    
Service period           1 year    
Plan 2009                
Stock Based Compensation Details [Line Items]                
Shares approved and authorized (in shares)   5,000,000            
Shares of common stock options outstanding (in shares)       3,163,968   3,163,968    
Additional shares authorized (in shares)     2,000,000          
Maximum number of shares to any individual (in shares)   1,000,000            
Common stock, shares outstanding (in shares)       1,413,687   1,413,687    
Plan 2009 | Employee Stock Option                
Stock Based Compensation Details [Line Items]                
Shares available for grant (in shares)       123,718   123,718    
Plan 2009 | Restricted Stock                
Stock Based Compensation Details [Line Items]                
Shares of common stock options outstanding (in shares)       107,959   107,959    
Plan 2016                
Stock Based Compensation Details [Line Items]                
Shares approved and authorized (in shares) 2,000,000              
Shares of common stock options outstanding (in shares)       20,000   20,000    
Shares available for grant (in shares)       1,501,019   1,501,019    
Maximum number of shares to any individual (in shares) 1,000,000              
Plan 2016 | Common Stock                
Stock Based Compensation Details [Line Items]                
Shares of common stock options outstanding (in shares)       666,145   666,145    
Plan 2016 | Restricted Stock                
Stock Based Compensation Details [Line Items]                
RSUs outstanding (in shares)       84,538   84,538    
Plan 2016, Plan 2009 And Director Plan | Employee Stock Option                
Stock Based Compensation Details [Line Items]                
Shares of common stock options outstanding (in shares)       4,330,113   4,330,113    
Director Plan And The 2009 Plan                
Stock Based Compensation Details [Line Items]                
Intrinsic value of options outstanding       $ 18,300   $ 18,300    
Intrinsic value of options exercisable       $ 16,100   $ 16,100    
[1] Derived from the audited December 31, 2016 financial statements