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Stockholders' Equity (Schedule of Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Stock options  
Balance at the beginning of period | shares 344,733
Granted | shares 27,000
Forfeited | shares (118,333)
Balance at the end of period | shares 253,400
Exercisable at the end of period | shares 203,733
Weighted average exercise price  
Balance at the beginning of period | $ / shares $ 9.35
Granted | $ / shares 3.68
Forfeited | $ / shares 9.34
Balance at the end of period | $ / shares 8.75
Exercisable at the end of period | $ / shares $ 9.29
Weighted average remaining contractual term  
Balance 6 years 4 months 24 days
Exercisable at the end of period (in years) 5 years 9 months 18 days
Aggregate intrinsic value  
Balance at the end of period | $ $ 75,590
Exercisable at the end of period | $ $ 30,500