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

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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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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt discount.

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

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Convertible Senior Notes - Narrative (Details)			3 Months Ended
Convertible Senior Notes - Narrative (Details)	Mar. 01, 2019 USD ($) day $ / shares	Feb. 19, 2019	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Non-cash interest expense			$ 656,248	$ 0
6.50% Convertible Senior Notes Due 2024 \| Convertible Debt
Debt Instrument [Line Items]
Principal amount	$ 78,500,000.0		$ 78,500,000
Debt instrument, interest rate, stated percentage			6.50%
Proceeds from issuance of debt	$ 75,700,000		$ 75,700,000
Debt instrument, convertible, conversion ratio		0.1858045
Debt instrument, convertible conversion price (in dollars per share) \| $ / shares	$ 5.38
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Debt instrument, convertible, threshold trading days \| day	20
Debt instrument, convertible, threshold consecutive trading days \| day	30
Debt instrument, redemption price percentage	100.00%
Long-term debt, fair value	$ 62,200,000
Unamortized debt issuance cost	2,800,000		2,221,571
Debt instrument, unamortized discount	$ 18,600,000		$ 16,141,134
Debt instrument, effective interest rate			13.20%
Non-cash interest expense			$ 656,000
Interest expense, contractual interest			$ 425,000