Debt instrument additional interest expense fee percentage.

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Debt instrument back-end facility fee percentage.

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Debt instrument interest added to principal value.

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Debt instrument maturity date extended.

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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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Increase to put option liability.

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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 conversion price per share of common stock.

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Percentage of conversion price per share of convertible preferred stock.

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Percentage of upper limit of employee salary to reduce forgiveness.

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Put option liability current.

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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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Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

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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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The price per share of the conversion feature embedded in the debt instrument.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 CCYY-MM-DD format.

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The fair value of notes issued in noncash investing and financing activities.

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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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Debt - Additional Information (Details) - USD ($)	1 Months Ended								2 Months Ended	12 Months Ended
Debt - Additional Information (Details) - USD ($)	Oct. 31, 2020	Aug. 31, 2020	Jun. 30, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Dec. 31, 2019	Feb. 28, 2018	Sep. 30, 2019	Dec. 31, 2020
Debt Instrument [Line Items]
Estimated air value of warrants issued										$ 300,000
Estimated value of put option liability							$ 3,261,000			$ 3,400,000
Common Stock
Debt Instrument [Line Items]
Debt instrument converted to common stock										20,091
March 2020 Notes
Debt Instrument [Line Items]
Interest rate					3.00%
Convertible notes payable					$ 10,000,000.0
Convertible notes, maturity date					Aug. 31, 2020
Extended debt instrument date		Jun. 30, 2021
Percentage of conversion price per share of common stock	80.00%				80.00%
Estimated value of put option liability					$ 2,500,000
Debt instrument converted to common stock	703,503
March 2020 Notes \| Common Stock
Debt Instrument [Line Items]
Conversion price	$ 14.40
March 2020 Notes \| First Tranche
Debt Instrument [Line Items]
Convertible notes payable					$ 5,000,000.0
March 2020 Notes \| Second Tranche
Debt Instrument [Line Items]
Convertible notes payable			$ 5,000,000.0
December 2019 Notes
Debt Instrument [Line Items]
Interest rate							3.00%
Convertible notes payable							$ 6,000,000.0
Convertible notes, maturity date							Aug. 31, 2020
Extended debt instrument date		Jun. 30, 2021
Percentage of conversion price per share of common stock	80.00%						80.00%
Estimated value of put option liability							$ 1,500,000
Debt instrument converted to common stock	426,386
December 2019 Notes \| Common Stock
Debt Instrument [Line Items]
Conversion price	$ 14.40
December 2019 Notes \| First Tranche
Debt Instrument [Line Items]
Convertible notes payable							3,000,000.0
December 2019 Notes \| Second Tranche
Debt Instrument [Line Items]
Convertible notes payable						$ 3,000,000.0
August 2019 Notes
Debt Instrument [Line Items]
Interest rate									3.00%
Convertible notes payable									$ 10,000,000.0
Convertible notes, maturity date									Aug. 31, 2020
Extended debt instrument date		Jun. 30, 2021
Percentage of conversion price per share of common stock	80.00%								95.00%
Estimated value of put option liability							$ 2,500,000		$ 500,000
Debt instrument converted to common stock	718,391
Percentage of conversion price per share of preferred stock							80.00%
Increase to put option liability							$ 2,000,000.0
August 2019 Notes \| Common Stock
Debt Instrument [Line Items]
Conversion price	$ 14.40
Series H Convertible Preferred Stock \| March 2020 Notes
Debt Instrument [Line Items]
Conversion rate					80.00%
Conversion price					$ 1.15
Series H Convertible Preferred Stock \| December 2019 Notes
Debt Instrument [Line Items]
Conversion rate							80.00%
Conversion price							$ 1.15
Series H Convertible Preferred Stock \| August 2019 Notes
Debt Instrument [Line Items]
Conversion price									$ 1.15
Percentage of conversion price per share of preferred stock									95.00%
2018 Notes
Debt Instrument [Line Items]
Loan principle amount							$ 24,270,000	$ 23,000,000.0		$ 24,972,000
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							$ 1,100,000			$ 1,700,000
Frequency of periodic payment										Commencing March 2021 and continuing through the maturity date February 2023, the outstanding principal is repayable in 24 equal monthly installments.
Debt instrument, prepayment penalty								3.00%
Debt instrument, back-end facility fee								2.00%
Debt instrument, additional interest expense fee								2.00%
2018 Notes \| Minimum
Debt Instrument [Line Items]
Early amortization of loan payment schedule								24 months
2018 Notes \| Maximum
Debt Instrument [Line Items]
Early amortization of loan payment schedule								36 months
2018 Notes \| Series G Preferred Stock
Debt Instrument [Line Items]
Warrant issued to purchase shares								613,333		613,333
PPP Loan
Debt Instrument [Line Items]
Loan description										The PPP Loan matures on the two-year anniversary of the funding date, April 2022, and bears interest at a fixed rate of 1.00% per annum. Monthly principal and interest payments, less the amount of any potential forgiveness (as discussed below), will 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
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