Long-Term Debt - Summary of long term debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 3,631	$ 3,524
Less current portion	(681)	(548)
Long-term debt, Noncurrent	2,950	2,976
Term loan payable to a financial institution; Interest rate option of bank prime or Libor plus 1.4% (2.76% as of December 31, 2017), monthly principal payments of $21,833 through 2021 with a balloon payment of $786,000 due December 1, 2021
Debt Instrument [Line Items]
Long-term debt	1,835	2,096
Term loan payable to a financial institution; Interest rate option of bank prime or Libor plus 1.4% (2.76% as of December 31, 2017), monthly principal payments of $23,810 through December 1, 2021
Debt Instrument [Line Items]
Long-term debt	1,142	1,428
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% - 1.831742% at time of funding)
Debt Instrument [Line Items]
Long-term debt	$ 654	$ 0