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

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Convertible Senior Notes - Net proceeds (Details)		1 Months Ended		12 Months Ended
Convertible Senior Notes - Net proceeds (Details)	Mar. 08, 2018 USD ($)	Sep. 30, 2019 USD ($) D $ / shares	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Mar. 31, 2019 $ / shares
Convertible Senior Notes
Principal amount			$ 100,000,000
Proceeds from issuance of debt				$ 39,052,000	$ 95,856,000
Maturity principal amount		$ 48,000,000
Unamortized debt discount and issuance costs		1,000,000
Closing price of the company's stock \| $ / shares						$ 2.35
$40M Convertible Senior Note
Convertible Senior Notes
Principal amount		$ 40,000,000		$ 48,000,000
Interest rate (as a percent)		7.50%
Proceeds from issuance of debt		$ 39,100,000
Percentage of principal amount to be repaid at maturity		120.00%
Maturity principal amount		$ 48,000,000
Conversion rates for the notes (in shares)		387.5969
Conversion price, per share \| $ / shares		$ 2.58
Consecutive trading days \| D		20
Conversion price (as a percent)		175.00%
Transaction costs for issuance		$ 8,000,000
Initial purchasers' discount		8,000,000
Remaining life of the convertible senior notes				37 months
Closing price of the company's stock \| $ / shares				$ 3.16
Fair value of convertible senior notes				$ 53,500,000
$40M Convertible Senior Note \| Level 3 \| Volatility
Convertible Senior Notes
Volatility assumption				70
$40M Convertible Senior Note \| Holder may require redemption
Convertible Senior Notes
Principal amount		40,000,000
Maturity principal amount		$ 48,000,000
Consecutive trading days \| D		5
Principal amount of the repurchased Convertible Senior Notes(as a percent)		115.00%
Principal amount (as a percent)		110.00%
Conversion ratio, principal amount		$ 1,000
$40M Convertible Senior Note \| Company may redeem with the consent of the holder
Convertible Senior Notes
Principal amount		40,000,000
Maturity principal amount		$ 48,000,000
Consecutive trading days \| D		5
Principal amount of the repurchased Convertible Senior Notes(as a percent)		105.00%
Principal amount (as a percent)		115.00%
Conversion ratio, principal amount		$ 1,000
$100M Convertible Senior Notes
Convertible Senior Notes
Principal amount	$ 100,000,000		$ 100,000,000	$ 100,000,000
Interest rate (as a percent)			5.50%
Proceeds from issuance of debt	52,356,000		$ 95,900,000
Conversion rates for the notes (in shares)		436.3002
Conversion price, per share \| $ / shares		$ 2.29
Trading days \| D		20
Consecutive trading days \| D		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%
Ownership interest percentage		50.00%
Percentage of principal amount to be redeemed		100.00%
Carrying amount of the liability component		$ 58,200,000
Carrying amount of the equity component		$ 37,700,000		37,702,000
Effective interest rate (as a percent)		16.00%
Transaction costs for issuance		$ 4,100,000
Initial purchasers' discount	3,300,000
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				39 months
Closing price of the company's stock \| $ / shares				$ 3.16
Fair value of convertible senior notes				$ 135,300,000