Common Stock, Common Stock Warrants and Stock Option Plan - Common Stock Warrants - Warrant Issued (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 31, 2020	Dec. 31, 2019	May 08, 2018
Tennenbaum Capital Partners, LLC Term Loan [Member] \| Secured Debt [Member]
Class of Warrant or Right [Line Items]
Unamortized debt discount			$ 4.8
Common Stock Warrants, Tennenbaum Capital Partners, LLC Warrant [Member]
Class of Warrant or Right [Line Items]
Number of warrants (in shares)			1
Number of shares warrants may purchase (in shares)	850,000	850,000	850,000
Number of shares each warrant may purchase (in shares)			850,000
Exercise price (in dollars per share)	$ 8.62	$ 8.30	$ 8.62
Term of warrant			6 years

Exercise price per share or per unit of warrants or rights outstanding.

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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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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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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Number of warrants or rights outstanding.

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Amount, after accumulated amortization, of debt discount.

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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