Stock-Based Compensation (Employee Stock Purchase Plan) (Details) - Employee Stock Purchase Plan - USD ($)		9 Months Ended
	Jun. 15, 2017	Sep. 30, 2017
Employee Stock Purchase Plan
Shares of common stock reserved for issuance		1,250,000
Increase in shares reserved for issuance	1,250,000
Shares of common stock available for future grant		1,472,746
Number of shares issued		106,847
Unrecognized compensation expense (in dollars)		$ 229,000
Weighted-average period of recognition of unrecognized stock-based compensation expense		2 months