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Loan Payable Term Loans (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount $ 758,000   $ 758,000    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 1,409,000   1,409,000   $ 585,000
Amortization of Debt Issuance Costs and Discounts 342,000 $ 78,000 493,000 $ 169,000  
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 1,409,000   1,409,000   585,000
Term Loan A [Member]          
Debt Instrument [Line Items]          
Loans Payable 10,000,000   10,000,000   10,000,000
Term Loan B [Member]          
Debt Instrument [Line Items]          
Loans Payable 10,000,000   10,000,000   10,000,000
Term Loan C [Member]          
Debt Instrument [Line Items]          
Loans Payable 15,000,000   15,000,000   0
Total Term Loans [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 35,000,000   35,000,000   20,000,000
Final fee obligation 1,537,000   1,537,000   400,000
Debt Instrument, Periodic Payment, Principal (952,000)   (952,000)   0
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (1,409,000)   (1,409,000)   (585,000)
Loans Payable 34,176,000   34,176,000   19,815,000
Loans Payable, Current (19,275,000)   (19,275,000)   (7,935,000)
Long-term Debt 14,901,000   $ 14,901,000   11,880,000
Investment, Interest Only Flag     Jun. 15, 2017    
Debt Instrument, Maturity Date     Jan. 12, 2019    
Debt Instrument, Interest Rate Terms     a) the greater of 1.00% or the 3-year treasury rate in effect at the time of funding, plus (b) an applicable margin between 4.95% and 5.90% per annum.    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (1,409,000)   $ (1,409,000)   $ (585,000)