Long-Term Debt - Summary of long term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 3,551	$ 3,631
Less current portion	(700)	(681)
Long-term debt, Noncurrent	2,851	2,950
Term loan payable to a financial institution; Interest rate option of bank prime or Libor plus 1.4% (3.06% as of March 31, 2018), monthly prinicipal payments of $21,833 through 2021 with a balloon payment of $786,000 due December 1, 2021
Debt Instrument [Line Items]
Long-term debt	1,769	1,835
Term loan payable to a financial institution; Interest rate option of bank prime or Libor plus 1.4% (3.06% as of March 31, 2018), monthly prinicipal payments of $23,810 through December 1, 2021
Debt Instrument [Line Items]
Long-term debt	1,071	1,142
Lease line of credit for equipment; Interest rate fixed for term of each funding based upon the Lender's lease pricing at time of funding. (Interest rate/factor 1.822758% - 1.8524982% at time of funding), monthly principal payments of $12,675 through January 8, 2022
Debt Instrument [Line Items]
Long-term debt	$ 711	$ 654