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Debt - 2019 Refinancing Agreement (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2021 | Jan. 01, 2020 | Oct. 01, 2019 USD ($) | Jul. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2019 | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) covenant shares | Aug. 31, 2020 | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | Apr. 30, 2019 USD ($) | Apr. 12, 2019 $ / shares shares | Nov. 30, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of number of shares |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Expense (income) recorded on change in fair value of warrant liability |  |  |  |  |  |  |  | $ 1,634,000 |  | $ (588,000) |  |  |  |
Gain on embedded derivative |  |  |  |  |  |  |  | $ 0 |  | $ 388,000 |  |  |  |
2019 Refinancing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000.0 |  |
Debt instrument, interest rate, effective percentage |  |  |  |  |  |  |  | 13.00% |  | 13.00% |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  |  | $ 1,000,000.0 | $ 1,400,000 |  | $ 700,000 |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |
Make-whole premium prepayment period |  |  |  |  |  |  | 19 months |  |  |  |  |  |  |
Make-whole provision applicable to interest period |  |  |  |  |  |  | 18 months |  |  |  |  |  |  |
Number of financial covenants | covenant |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Leverage ratio |  |  | 330.00% |  | 425.00% | 425.00% | 400.00% |  | 461.00% |  |  |  |  |
Leverage ratio minimum requirement |  |  |  |  |  |  |  |  | 4.00 |  |  |  |  |
Debt instrument, interest rate, increase (decrease) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Time until expiration (years) |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Warrants and rights outstanding |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |
Derivative liability |  |  |  |  |  |  |  | 400,000 |  | 0.0 |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |
Debt issuance costs, net |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |  |
Interest expense, debt |  |  |  |  |  |  |  | 500,000 |  | 300,000 |  |  |  |
Expense (income) recorded on change in fair value of warrant liability |  |  |  |  |  |  |  | 1,600,000 |  | (600,000) |  |  |  |
Gain on embedded derivative |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |
2019 Refinancing Amendment Number One and Waiver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  |  |  |  | 50.10% |  |  |  |  |  |
Leverage ratio |  |  | 330.00% |  | 425.00% |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, increase (decrease) |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of customer accounts required to approve amendment |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, non refundable waiver fee |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |
Debt instrument, non refundable amendment fee |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Refinancing Term Loan 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral coverage amount |  |  |  |  |  |  |  | 37,900,000 |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | 39,000,000 |  |  |  |  |  |
Debt outstanding balance in excess of collateral coverage amount |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |
2019 Refinancing Term Loan embedded derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Number of warrants per each share of common stock (in shares) | shares |  |  |  |  |  |  |  | 0 |  |  |  |  | 263,314 |
Warrant exercise price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.63 |
Refinancing Agreement 2019 First Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |
Minimum | 2019 Refinancing Amendment Number One and Waiver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, liquidity of loan parties |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |
LIBOR Rate | 2019 Refinancing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread over variable rate |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |
LIBOR Rate | Minimum | 2019 Refinancing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread over variable rate |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Base Rate | 2019 Refinancing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread over variable rate |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Base Rate | Minimum | 2019 Refinancing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread over variable rate |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Forecast | 2019 Refinancing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 200.00% |  |  | 200.00% |  |  |  |  |  |  |  |  |  |
Forecast | 2019 Refinancing Amendment Number One and Waiver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 200.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0

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