Commitments and Contingencies - Future Minimum Principal Payments (Details)	Jun. 30, 2018 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
Remaining in 2018	$ 7,500,000
2019	15,000,000
2020	26,250,000
Total minimum loan payments	48,750,000
Interest payments due in 2018	30,000
Interest payments due in 2019	40,000
Interest payments due in 2020	10,000
Interest Rate Cap
Long-term Debt, Fiscal Year Maturity [Abstract]
Remaining notional amount	33,800,000
At inception notional	$ 15,000,000

Derivative, Notional Amount At Inception. Expressed as an absolute value.

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Derivative, Remaining Notional Amount

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- Definition

Long-term Debt, Maturities, Future Interest Payments Due in Year Two

+ References

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- Definition

Long-term Debt, Maturities, Future Interest Payments in Next Twelve Months

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Long-term Debt, Maturities, Future Interest Payments in Remainder of Fiscal Year

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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