Debt instrument interest added to principal value.

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- Definition

Debt instrument, percentage of stated interest rate added to principal value of notes payable.

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Debt instrument, percentage of stated interest rate, paid in cash.

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Debt instrument prepayment penalty percentage.

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Milestone payment.

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Minimum liquidity ratio covenant.

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Partial repayments of debt.

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Payroll costs excludes compensation of an employee.

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Percentage for non-payroll costs.

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Percentage of minimum revenue requirement.

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Percentage of upper limit of employee salary to reduce forgiveness.

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Prepayment fee waived amount.

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Put option liability current.

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Revenue milestone.

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Upper limit of employee salary to reduce forgiveness.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Fair value portion of warrants not settleable in cash classified as equity.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended			12 Months Ended
Debt - Additional Information (Details) - USD ($)	Dec. 31, 2021	Mar. 19, 2021	Apr. 30, 2020	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Feb. 28, 2018
Debt Instrument [Line Items]
Estimated air value of warrants issued	$ 300,000						$ 300,000
Cash and cash equivalents	32,712,000						32,712,000	$ 62,126,000
Gain (loss) on debt extinguishment							2,298,000
Estimated value of put option liability								3,400,000
Cash paid for interest							1,676,000	$ 1,844,000
Common Stock
Debt Instrument [Line Items]
Debt instrument converted to common stock								20,091,000
2021 Term Loan
Debt Instrument [Line Items]
Loan principle amount	10,000,000	$ 30,000,000					$ 10,000,000
Debt instrument frequency of periodic payment		monthly
Revenue milestone						$ 65,000,000
Debt instrument, covenant description							The 2021 Term Loan requires the Company to comply with a minimum liquidity ratio covenant (as defined) by the 2021 Term Loan of not less than 0.95 to 1.00, and has a trailing six month rolling minimum revenue requirement of not less than 70% of the Company’s projected revenue performed at the end of each reporting period.
Debt instrument, covenant compliance							the Company was in compliance with all restrictive and financial covenants associated with its borrowings.
Debt instrument description							The 2021 Term Loan provides for an “interest-only” period from the Effective Date through February 28, 2023, with interest due and payable monthly on the first calendar day of each month. However, the Company achieved a revenue milestone of at least $65 million on a trailing twelve-month basis during the three months ended March 31, 2021 which automatically extended the interest-only period through February 28, 2024. Beginning on the first calendar day of the month following the end of the interest-only period, the 2021 Term Loan shall be payable in (i) consecutive equal installments of principal through March 1, 2026, plus (ii) monthly payments of accrued interest. The principal amount outstanding under the 2021 Term Loan shall accrue interest at a floating per annum rate equal to the greater of (i) 2.00% above the prime rate, or (ii) 5.25%, which interest, in each case, shall be payable monthly. Changes to the interest rate applicable to the 2021 Term Loan based on changes to the prime rate shall be effective on the effective date of any change to the prime rate.
Debt instrument maturity date		Mar. 01, 2026
Repayments of Debt		$ 2,700,000
2021 Term Loan \| Prior to First Anniversary
Debt Instrument [Line Items]
Debt instrument, prepayment penalty		3.00%
2021 Term Loan \| Prior to Second Anniversary
Debt Instrument [Line Items]
Debt instrument, prepayment penalty		2.00%
2021 Term Loan \| After Second Anniversary, Prior to October 19, 2025
Debt Instrument [Line Items]
Debt instrument, prepayment penalty		1.00%
2021 Term Loan \| Thereafter
Debt Instrument [Line Items]
Debt instrument, prepayment penalty		0.00%
2021 Term Loan \| Maximum
Debt Instrument [Line Items]
Minimum liquidity ratio covenant		0.0095
Percentage of minimum revenue requirement		70.00%					75.00%
2021 Term Loan \| Maximum \| Forecast
Debt Instrument [Line Items]
Percentage of minimum revenue requirement				75.00%
2021 Term Loan Amendment
Debt Instrument [Line Items]
Restricted cash collateral account	15,000,000						$ 15,000,000
2021 Term Loan Amendment \| Maximum
Debt Instrument [Line Items]
Cash and cash equivalents	40,000						$ 40,000
Second Amendment
Debt Instrument [Line Items]
Milestone payment	4,600,000
Gain (loss) on debt extinguishment	(100,000)
Partial repayments of debt	20,000,000
Prepayment fee waived amount	600,000
Write-off of debt issuance costs	20,000,000
Repayments of Debt	$ 20,000,000
2018 Notes
Debt Instrument [Line Items]
Loan principle amount								$ 24,972,000	$ 23,000,000.0
Facility fee amount									200,000
Estimated air value of warrants issued									$ 300,000
Interest rate									10.00%
Percentage of interest rate, paid in cash									7.50%
Percentage of interest rate added to principal value of notes payable									2.50%
Interest added to principal value						1,700,000		1,700,000
Gain (loss) on debt extinguishment						$ (700,000)
Repayments of Debt		$ 25,900,000
2018 Notes \| Series G Preferred Stock
Debt Instrument [Line Items]
Warrant issued to purchase shares	613,333						613,333		613,333
PPP Loan
Debt Instrument [Line Items]
Debt instrument description							The PPP Loan had a maturity date on the two-year anniversary of the funding date, April 2022, and included a fixed rate of 1.00% per annum. Monthly principal and interest payments, less the amount of any potential forgiveness (as discussed below), were scheduled to commence in September 2021. The Company did not provide any collateral or guarantees in connection with the PPP Loan, nor did the Company pay any facility charge to obtain the PPP Loan.
PPP Loan \| Interest-bearing Deposits
Debt Instrument [Line Items]
Interest rate			1.00%
PPP Loan \| CARES Act
Debt Instrument [Line Items]
Loan principle amount			$ 3,100,000					$ 3,107,000
Gain (loss) on debt extinguishment					$ 3,100,000
Current portion of notes payable					$ 3,100,000
Percentage for non-payroll costs			40.00%
Upper limit of employee salary to reduce forgiveness			$ 100,000
Percentage of upper limit of employee salary to reduce forgiveness			25.00%
PPP Loan \| Minimum \| CARES Act
Debt Instrument [Line Items]
Payroll costs excludes compensation of an employee			$ 100,000