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Convertible Notes - Additional Information (Details) - USD ($)			1 Months Ended								12 Months Ended
	Feb. 18, 2018	Feb. 17, 2018	Aug. 31, 2019	Feb. 28, 2019	Oct. 31, 2018	Aug. 31, 2018	Feb. 28, 2018	Aug. 31, 2017	Feb. 28, 2017	Mar. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Interest expense											$ 220,000	$ 582,000	$ 927,000
Payment on principle amount of note												7,365,000
Senior Secured Convertible Notes due August 15 2018
Debt Instrument [Line Items]
Stated interest rate					8.00%					10.00%
Principal amount										$ 8,000,000
Redemption purchase price	100.00%	120.00%
Minimum ownership percentage triggering event for redemption of notes										40.00%
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments										$ 5,000,000
Payment on principle amount of note					$ 7,400,000
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs
Debt Instrument [Line Items]
Debt issuance costs										$ 100,000
Interest expense											0	$ 30,000	$ 45,000
Senior Secured Convertible Notes due August 15 2018 | Minimum
Debt Instrument [Line Items]
Percentage of beneficial ownership if effective upon conversion date of debt instrument										19.90%
Senior Secured Convertible Notes due August 15 2018 | Maximum
Debt Instrument [Line Items]
Period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts										90 days
Senior Secured Convertible Notes due August 15, 2023
Debt Instrument [Line Items]
Conversion price					$ 11.434					$ 170.00
Outstanding Notes payable											$ 2,900,000
Interest Note
Debt Instrument [Line Items]
Conversion price											$ 11.434
Number of shares issuable if notes converted to shares of common stock											253,630
Semi-annual interest payments			$ 109,000	$ 78,000		$ 383,000	$ 463,000	$ 434,000	$ 420,000

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The percentage of beneficial ownership if effective upon the applicable conversion date of debt instrument.

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The period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts pledged under the debt instrument conversion features, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum amount of indebtedness subordinated by security interest and cash payment rights under the convertible debt instruments.

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Debt instrument convertible number of shares of common stock.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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

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Face (par) amount of debt instrument at time of issuance.

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

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Percentage of principal amount of debt redeemed.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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