Stock-Based Compensation (Employee Stock Purchase Plan) (Details) - Employee Stock Purchase Plan	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($) shares	Jun. 30, 2016 USD ($) shares
Employee Stock Purchase Plan
Shares of common stock reserved for issuance	1,250,000	1,250,000
Shares of common stock available for future grant	436,624	436,624
Number of shares issued	119,272	119,272
Unrecognized compensation expense (in dollars) | $	$ 660,000	$ 660,000
Weighted-average period of recognition of unrecognized stock-based compensation expense		5 months