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v3.21.2

Long-Term Debt, Net of Financing Fees - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 10, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) fiscal_quarter | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Financing costs paid |  |  |  |  | $ 0 | $ 642 |  |  |
Interest expense |  |  | $ 417 | $ 397 | 1,427 | $ 459 |  |  |
Restricted cash |  |  | 6,333 |  | 6,333 |  |  |  | $ 6,842
Standby Letters of Credit | Heights Union |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount |  |  | 250 |  | 250 |  |  | $ 250 |
Restricted Cash |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount |  |  | $ 6,000 |  | 6,000 |  |  |  | 6,000
Oberland Option |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of warrants (in USD per share) | $ / shares | $ 14.13 |  |  |  |  |  |  |  |
Oberland Option | TPC Investments II LP, A Wholly Owned Subsidiary Of Oberland Capital |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shares called by warrants (in shares) | shares | 247,699 |  |  |  |  |  |  |  |
Oberland Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term of debt |  | 7 years |  |  |  |  |  |  |
Financing costs |  | $ 642 |  |  |  |  |  |  |
Financing costs paid |  |  |  |  | $ 642 |  |  |  |
Period for which quarterly interest payments should be made |  | 7 years |  |  |  |  |  |  |
Interest rate |  | 7.50% |  |  |  |  |  |  |
Interest rate at period end |  |  | 9.50% |  | 9.50% |  |  |  |
Threshold revenue achievement for payment of additional quarterly royalty |  | $ 70,000 |  |  |  |  |  |  |
Additional payment percentage |  | 1.00% |  |  |  |  |  |  |
Interest expense |  |  | $ 337 |  | $ 590 |  |  |  |
Cash paid for interest |  |  | 1,218 |  | 2,890 |  |  |  |
Interest capitalized |  |  | 1,338 |  | 2,526 |  |  |  |
Accumulated capitalized interest costs |  |  | 3,495 |  | $ 3,495 |  |  |  |
Make-whole payment, minimum required internal rate of return |  | 11.50% |  |  |  |  |  |  |
Increase in interest rate |  | 4.00% |  |  |  |  |  |  |
Liquidity covenant multiplier |  | 1.1 |  |  |  |  |  |  |
Oberland Facility | Each of Third And Fourth Quarter of 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revenue target |  | $ 8,750 |  |  |  |  |  |  |
Oberland Facility | Each Of The First And Second Quarter of 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revenue target |  | 17,500 |  |  |  |  |  |  |
Oberland Facility | Each Quarter After The Second Quarter of 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revenue target |  | 20,000 |  |  |  |  |  |  |
Oberland Facility | Oberland Option |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Value of warrants outstanding |  | $ 3,500 |  |  |  |  |  |  |
Moving average of closing stock |  |  |  |  | 45 days |  |  |  |
Gross proceeds from warrant exercises | $ 3,500 |  |  |  |  |  |  |  |
Oberland Facility | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Additional interest floor rate |  | 2.00% |  |  |  |  |  |  |
First Tranche |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Oberland Facility |  | $ 35,000 | 35,000 |  | $ 35,000 |  |  |  | 35,000
First Tranche | Debt derivative liabilities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Fair value of derivatives |  | 2,387 |  |  |  |  |  |  |
Second Tranche |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Oberland Facility |  |  | $ 15,000 |  | $ 15,000 |  | $ 15,000 |  | $ 0
Second Tranche | Debt derivative liabilities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Fair value of derivatives |  | 1,173 |  |  |  |  |  |  |
Third Tranche |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Contingent additional borrowing capacity |  | $ 25,000 |  |  |  |  |  |  |
Number of quarters | fiscal_quarter |  | 2 |  |  |  |  |  |  |
Revenue threshold necessary to obtain additional borrowing |  | $ 28,000 |  |  |  |  |  |  |

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