Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2016	Nov. 20, 2015
Debt Instrument [Line Items]
Notes payable gross	$ 65,313,000	$ 65,937,000
Less deferred financing costs, net of accumulated amortization	(413,000)	(463,000)
Total notes payable	64,900,000	65,474,000
Interest rate			10.00%
$37.0 million 3.76% Note, due December 1, 2020
Debt Instrument [Line Items]
Notes payable gross	33,662,000	34,166,000
Debt Instrument, face amount	$ 37,000,000.0	$ 37,000,000.0
Interest rate	3.76%	3.76%
$16.5 million 4.97% Note, due September 26, 2023
Debt Instrument [Line Items]
Notes payable gross	$ 16,178,000	$ 16,298,000
Debt Instrument, face amount	$ 16,500,000.0	$ 16,500,000.0
Interest rate	4.97%	4.97%
Related party Note, LIBOR plus 1.40% to 1.95%, due December 8, 2018
Debt Instrument [Line Items]
Notes payable gross	$ 15,473,000	$ 15,473,000
Related party Note, LIBOR plus 1.40% to 1.95%, due December 8, 2018 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Variable rate	1.40%	1.40%
Related party Note, LIBOR plus 1.40% to 1.95%, due December 8, 2018 \| LIBOR \| Maximum [Member]
Debt Instrument [Line Items]
Variable rate	1.95%	1.95%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

Deferred Financing Costs, Net of Accumulated Amortization

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- Definition

Notes Payable Gross

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