Convertible Senior Notes - Capped Call and Common Stock Forward (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
Mar. 31, 2019	Jun. 30, 2019
Capped Call and Common Stock Forward
Share Price	$ 2.35
Common stock shares issued	10,000,000
Capped Call
Capped Call and Common Stock Forward
Capped call options amount		$ 16.0
Cap price		$ 3.82
Premium (as a percent)		100.00%
Share Price		$ 1.91
Common Stock Forward
Capped Call and Common Stock Forward
Common stock shares issued		14,397,906
Net cost incurred		$ 27.5

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Name Regulation S-X (SX)
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-Section 13
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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