Sum of investments and unrestricted cash as of the balance sheet date.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Basis of Presentation (Details) $ in Thousands		3 Months Ended						9 Months Ended
Basis of Presentation (Details) $ in Thousands	Feb. 08, 2019	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Basis of Presentation
Cash, cash equivalents and marketable securities		$ 72,900						$ 72,900
Net Loss		$ (11,413)	$ (11,779)	$ (17,239)	$ (7,243)	$ (16,407)	$ (118,131)	(40,431)	$ (141,781)
Net cash used in operations								$ 35,415	$ 59,805
Reverse stock split	0.067