Stockholders' Equity (Schedule of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Stock options
Balance at the beginning of period | shares	344,733
Granted | shares	27,000
Forfeited | shares	(36,667)
Balance at the end of period | shares	335,066
Exercisable at the end of period | shares	285,400
Weighted average exercise price
Balance at the beginning of period | $ / shares	$ 9.35
Granted | $ / shares	3.68
Forfeited | $ / shares	9.16
Balance at the end of period | $ / shares	8.92
Exercisable at the end of period | $ / shares	$ 9.32
Weighted average remaining contractual term
Balance	6 years 6 months
Exercisable at the end of period (in years)	6 years
Aggregate intrinsic value
Balance at the end of period | $	$ 83,050
Exercisable at the end of period | $	$ 40,600