Notes Payable and Revolving Line of Credit - Interest Rate Swap Agreements - Additional Information (Details)	1 Months Ended
	Jul. 31, 2014 USD ($) Agreement	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Line Of Credit Facility [Line Items]
Number of interest rate swap agreement | Agreement	2
Interest rate swap agreement initial notional amount		$ 19,585,000
Fair value of interest rate swaps, liability		464,000	$ 431,000
Agreement One
Line Of Credit Facility [Line Items]
Interest rate swap agreement initial notional amount	$ 8,900,000	7,977,000
Interest rate swap agreement percentage	4.21%
Fair value of interest rate swaps, liability		116,000
Agreement Two
Line Of Credit Facility [Line Items]
Interest rate swap agreement initial notional amount	$ 13,200,000	11,608,000
Interest rate swap agreement percentage	4.73%
Fair value of interest rate swaps, liability		$ 348,000