Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Tenant Receivables   $ 1,253 $ 704    
Escrow Deposit   2,508 1,638    
Deferred Costs and Other Assets   5,171 3,993    
Deferred Rent Receivables, Net   5,014 3,842    
Debt Issuance Costs, Net   3,105 2,750    
Security Deposit Liability   4,912 2,128    
Receivables Earned But Not Paid Relating To Tenant Rent   166 125    
Receivables To Be Collected To Pay Specific Tenant Expenses   1,009 579    
Other Assets, Noncurrent   527 459    
Other Deferred Costs, Net   151 157    
Capitalized Costs, Acquisitions Of Property   284      
Prepaid Expense     58    
Lease Deposit Liability   703 508    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 10,131 [1] 7,401 [1] 7,114 [1]   $ 20,612
Other Assets, Miscellaneous, Current   78      
Construction in Progress, Gross   185      
Other Assets   459      
Accumulated Capitalized Interest Costs   316      
Prepaid Expense and Other Assets   143      
Revolving Credit Facility [Member]          
Debt Issuance Costs, Net   3,105 2,750 $ 1,223  
Reclassification of Costs to Value of Facilities $ 1,223        
Plano Lease [Member]          
Security Deposit Liability   $ 4,209 $ 1,620    
[1] Represents the total of the amounts at the end of the periods presented on the Consolidated Statements of Cash Flows as required by ASU 2016-18. The cash and cash equivalents and restricted cash balance as of December 31, 2017 and December 31, 2016 were $7,114 and $20,612, respectively.