Stock-Based Compensation (Details) - USD ($)	1 Months Ended	12 Months Ended
	May. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized in connection with the issuance of Deferred Stock Units (in US dollars)		$ 600,000	$ 394,000	$ 394,000
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant under the plan		887,859
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Number		6,881
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Granted Per Director (in shares)	176
Expense recognized in connection with the issuance of Deferred Stock Units (in US dollars)	$ 450,000
Expense per grant recognized in connection with the issuance of Deferred Stock Units (in US dollars)	$ 56,250
Deferred Stock Units [Member] | Newly Appointed Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Granted Per Director (in shares)	468
Expense recognized in connection with the issuance of Deferred Stock Units (in US dollars)	$ 150,000