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Convertible Senior Notes - Narrative (Details)		3 Months Ended		6 Months Ended
	Mar. 01, 2019 USD ($) day $ / shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
Non-cash interest expense		$ 2,194,783	$ 0	$ 2,851,031	$ 0
6.50% Convertible Senior Notes Due 2024 | Convertible Debt
Debt Instrument [Line Items]
Principal amount	$ 78,500,000.0	$ 78,500,000.0		$ 78,500,000.0
Debt instrument, interest rate, stated percentage	6.50%	6.50%		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	$ 2,124,567		2,124,567
Debt instrument, unamortized discount	$ 18,600,000	$ 15,436,340		$ 15,436,340
Debt instrument, effective interest rate		13.10%		13.10%
Non-cash interest expense		$ 2,200,000		$ 2,900,000
Interest expense, contractual interest		$ 1,400,000		$ 1,800,000

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