Long-Term Debt - Additional Information (Details) - USD ($)
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1 Months Ended |
3 Months Ended |
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Mar. 31, 2021 |
Dec. 31, 2015 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Apr. 08, 2020 |
Dec. 31, 2019 |
Mar. 01, 2019 |
Dec. 31, 2018 |
Aug. 31, 2018 |
Feb. 28, 2017 |
| Debt Instrument [Line Items] |
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| Outstanding balance |
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$ 154,222,000
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$ 154,666,000
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| Outstanding on loan |
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152,513,000
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153,048,000
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| Unamortized debt issuance costs |
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$ 1,709,000
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1,618,000
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| Prime Rate |
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| Debt Instrument [Line Items] |
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| Debt instrument, interest rate |
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3.50%
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| RDS equipment and vehicle notes |
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| Debt Instrument [Line Items] |
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| Debt instrument, maturity date |
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May 31, 2023
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| Outstanding balance |
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$ 398,000
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489,000
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| December 2015, ASG loan agreement |
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| Debt Instrument [Line Items] |
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| Aggregate amount |
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$ 1,700,000
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| Debt instrument, interest rate |
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3.75%
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| Debt instrument, maturity date range, start |
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Apr. 08, 2016
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| Debt instrument, maturity date range, end |
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Mar. 08, 2021
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| Outstanding on loan |
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$ 300,000
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400,000
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| February 2017, ASG financing agreement |
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| Debt Instrument [Line Items] |
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| Debt instrument, maturity date range, start |
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Jul. 01, 2017
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| Debt instrument, maturity date range, end |
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Feb. 28, 2023
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| Outstanding on loan |
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$ 155,400,000
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$ 11,500,000
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$ 144,200,000
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| Line of credit facility, maximum borrowing capacity |
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$ 174,200,000
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$ 101,400,000
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$ 105,000,000
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| Debt instrument leverage ratio |
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3.90%
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| February 2017, ASG financing agreement | Leverage Ratio Greater Than 2.40 | Minimum |
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| Debt Instrument [Line Items] |
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| Debt instrument leverage ratio |
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2.40%
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| February 2017, ASG financing agreement | Leverage Ratio Greater Than 2.40 | Base Rate |
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| Debt Instrument [Line Items] |
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| Debt instrument margin basis point |
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4.75%
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| February 2017, ASG financing agreement | Leverage Ratio Greater Than 2.40 | LIBOR |
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| Debt Instrument [Line Items] |
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| Debt instrument margin basis point |
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6.75%
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| February 2017, ASG financing agreement | Leverage Ratio Less Than 2.40 | Maximum |
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| Debt Instrument [Line Items] |
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| Debt instrument leverage ratio |
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2.40%
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| February 2017, ASG financing agreement | Leverage Ratio Less Than 2.40 | Base Rate |
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| Debt Instrument [Line Items] |
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| Debt instrument margin basis point |
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4.25%
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| February 2017, ASG financing agreement | Leverage Ratio Less Than 2.40 | LIBOR |
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| Debt Instrument [Line Items] |
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| Debt instrument margin basis point |
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6.25%
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| February 2017, ASG financing agreement | Forecast |
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| Debt Instrument [Line Items] |
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| Debt instrument leverage ratio |
3.75%
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3.90%
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3.90%
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3.90%
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| ASG term loans |
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| Debt Instrument [Line Items] |
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| Outstanding balance |
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$ 153,824,000
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154,177,000
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| Non-cash interest expense |
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100,000
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$ 100,000
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| Unamortized debt issuance costs |
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$ 2,000,000
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$ 2,100,000
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| ASG term loans | Minimum | Subsequent Event |
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| Debt Instrument [Line Items] |
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| Financial covenant availability |
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$ 35,000,000
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