Credit Agreement - Narrative (Details)	Sep. 25, 2019 USD ($)	Aug. 06, 2019 USD ($)	May 15, 2019 USD ($)	Apr. 05, 2019 USD ($)	Oct. 15, 2018 USD ($)	Aug. 31, 2018 USD ($) extension_period shares	Aug. 07, 2017 USD ($) $ / shares shares	Jun. 30, 2017	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Aug. 31, 2019 USD ($) $ / shares shares	May 31, 2019 USD ($) $ / shares shares	Apr. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($) $ / shares shares	Aug. 31, 2017 USD ($) $ / shares shares
Line of Credit Facility [Line Items]
Number of optional extension periods | extension_period						2
Duration of optional extension periods						1 year
Initial Term Loan
Line of Credit Facility [Line Items]
Diluted undistributed earnings (as a percent)							7.50%
Exercise price (USD per share) | $ / shares							$ 1.92
Remaining discount amortization period							48 months
Transaction costs							$ 600,000
Initial Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Long-term borrowings outstanding						$ 44,000,000	44,000,000		$ 64,300,000					$ 45,800,000
Additional Term Loan
Line of Credit Facility [Line Items]
Number of optional extension periods | extension_period						2
Duration of optional extension periods						1 year
Diluted undistributed earnings (as a percent)								0.15%
Securities called per warrant (shares) | shares						77,267
Allotment of securities called by warrants						$ 1,000,000.0
Additional Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Long-term borrowings outstanding									$ 64,300,000
Maximum borrowing capacity under credit facility						$ 25,000,000	$ 15,000,000			$ 25,000,000
Proceeds from credit facility	$ 5,000,000	$ 5,000,000	$ 6,000,000	$ 5,000,000	$ 4,000,000
Term Loan and Additional Term Loans
Line of Credit Facility [Line Items]
Remaining discount amortization period							48 months
New Credit Agreement
Line of Credit Facility [Line Items]
Floor rate (as a percent)						1.00%
Weighted-average interest rate (as a percent)									11.80%					8.00%
Periodic principal payment (as a percent)						5.00%
Debt to EBITDA ratio							6.00
Securities called by warrants (shares) | shares							3,863,326
New Credit Agreement | Minimum
Line of Credit Facility [Line Items]
Excess cash flow (as a percent)						0.00%
New Credit Agreement | Maximum
Line of Credit Facility [Line Items]
Excess cash flow (as a percent)						75.00%
Amendment Number One to Credit Agreement
Line of Credit Facility [Line Items]
Securities called by warrants (shares) | shares										386,333	386,333	463,599	386,333		309,066	3,863,326
Exercise price (USD per share) | $ / shares										$ 1.92	$ 1.92	$ 1.92	$ 1.92		$ 1.92	$ 1.92
Value of warrants outstanding										$ 200,000	$ 200,000	$ 400,000	$ 400,000		$ 200,000	$ 3,300,000
London Interbank Offered Rate (LIBOR) | New Credit Agreement | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)						5.50%
London Interbank Offered Rate (LIBOR) | New Credit Agreement | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)						10.00%
Redemption Period One | Additional Term Loan
Line of Credit Facility [Line Items]
Diluted undistributed earnings (as a percent)								1.00%
Securities called per warrant (shares) | shares						515,110
Redemption Period One | New Credit Agreement
Line of Credit Facility [Line Items]
Interest coverage ratio							1.0
Redemption Period Two | Additional Term Loan
Line of Credit Facility [Line Items]
Diluted undistributed earnings (as a percent)								1.50%
Securities called per warrant (shares) | shares						772,665
Redemption Period Two | New Credit Agreement
Line of Credit Facility [Line Items]
Interest coverage ratio							1.25