Debt - Debt Covenant Compliance (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Line of Credit | 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Minimum Aggregate Revenue (LTM) as of the of twelve months ended June 30, 2018	$ 70,000
Minimum Aggregate Revenue (LTM) as of the of twelve months ended September 30, 2018	71,000
Minimum Aggregate Revenue (LTM) as of the of twelve months ended December 31, 2018	74,000
Minimum Aggregate Revenue (LTM) as of each fiscal quarter thereafter	75,000
Line of Credit | Term Loans
Debt Instrument [Line Items]
Minimum Aggregate Revenue (LTM) as of the of twelve months ended June 30, 2018	70,000
Minimum Aggregate Revenue (LTM) as of the of twelve months ended September 30, 2018	71,000
Minimum Aggregate Revenue (LTM) as of the of twelve months ended December 31, 2018	74,000
Minimum Aggregate Revenue (LTM) as of each fiscal quarter thereafter	75,000
Term Loans | 2016 Credit and Security Agreement
Debt Instrument [Line Items]
Minimum Adjusted EBITDA as of the end of twelve months ended June 30, 2018	5,200
Minimum Adjusted EBITDA as of the end of twelve months ended September 30, 2018	6,000
Minimum Adjusted EBITDA as of the end of twelve months ended December 31, 2018	8,000
Minimum Adjusted EBITDA as of the end of twelve months for each of fiscal quarter thereafter	9,000
Minimum Consolidated Unencumbered Liquid Assets as of each fiscal quarter thereafter	1,000
Term Loans | Term Loans
Debt Instrument [Line Items]
Minimum Adjusted EBITDA as of the end of twelve months ended June 30, 2018	5,200
Minimum Adjusted EBITDA as of the end of twelve months ended September 30, 2018	6,000
Minimum Adjusted EBITDA as of the end of twelve months ended December 31, 2018	8,000
Minimum Adjusted EBITDA as of the end of twelve months for each of fiscal quarter thereafter	9,000
Minimum Consolidated Unencumbered Liquid Assets as of each fiscal quarter thereafter	$ 1,000