Convertible Senior Notes - Conversion (Details)		3 Months Ended
Mar. 08, 2018 USD ($)	Mar. 31, 2019 USD ($) item $ / shares
Convertible Senior Notes
Ownership interest percentage		50.00%
Closing price of the company's stock \| $ / shares		$ 2.35
Convertible Senior Notes
Convertible Senior Notes
Conversion ratio, principal amount		$ 1,000
Conversion rates for the notes (in shares)		436.3002
Conversion price, per share \| $ / shares		$ 2.29
Trading days \| item		20
Consecutive Trading days \| item		30
Conversion price (as a percent)		130.00%
Number of business days		5 days
Number of consecutive trading days		5 days
Principal amount (as a percent)		98.00%
Principal amount of the repurchased Convertible Senior Notes(as a percent)		100.00%
Percentage of principal amount to be redeemed		100.00%
Carrying amount of the liability component		$ 58,200,000
Effective interest rate (as a percent)		16.00%
Transaction costs for issuance		$ 4,100,000
Initial purchasers' discount	$ 3,250,000
Other issuance costs	$ 894,000	1,700,000
Transaction costs attributable to the liability component		2,400,000
Transaction costs attributable to the equity component		$ 1,700,000
Remaining life of the Convertible Senior Notes		48 months
Closing price of the company's stock \| $ / shares		$ 2.40
Convertible senior note, if convertible value		$ 104,700,000

Discount cost incurred related to the issuance of the debt.

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Other cost incurred related to the issuance of the debt.

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Number of business days.

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Percentage of the principal amount of the repurchased Convertible Senior Notes, plus accrued and unpaid interest.

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Percentage of product of the last reported sale price of the Company?s common stock and the conversion rate for the notes on each such trading day.

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The amount of transaction costs attributable to the equity component.

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The amount of transaction costs attributable to the liability component.

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The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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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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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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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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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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Percentage of principal amount of debt redeemed.

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

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Price of a single share of a number of saleable stocks of a company.

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