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Organization (Details)			3 Months Ended	12 Months Ended
	Oct. 14, 2019 shares	Jun. 26, 2019 USD ($) series_of_warrant shares	Mar. 31, 2020 USD ($) segment $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares
Restructuring Cost and Reserve [Line Items]
Number of operating segments | segment			1
Common stock, par value (in dollars per share) | $ / shares			$ 0.001	$ 0.001	$ 0.001
Common Stock warrants exercised (in shares) | shares	2,728,513
Private Placement
Restructuring Cost and Reserve [Line Items]
Sale of common stock (in shares) | shares		2,728,513
Number of series of warrants | series_of_warrant		4
Aggregate gross proceeds from sale		$ 20,000,000.0
Convertible senior notes
Restructuring Cost and Reserve [Line Items]
Face value of note			$ 204,000,000		$ 204,000,000
Outstanding debt			186,115,000		184,075,000
Convertible senior notes | Initial Notes | Starboard Value LP
Restructuring Cost and Reserve [Line Items]
Face value of note				$ 204,000,000.0
Cash proceeds				$ 100,000,000.0
Converted shares issued (in shares) | shares				4,000,000
Secured Term Note | Secured Term Note
Restructuring Cost and Reserve [Line Items]
Face value of note			$ 13,000,000		$ 13,000,000.0
Stated interest rate			9.75%		9.75%
Outstanding debt			$ 12,410,000		$ 12,463,000
Convertible senior notes and Secured Term Note | Initial Notes and Secured Term Note
Restructuring Cost and Reserve [Line Items]
Outstanding debt			$ 217,000,000.0

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