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Selected Quarterly Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 111	$ 1,801	$ 254	$ 354	$ 111	$ 111	$ 2,111	$ 111	$ 2,520	$ 2,444
Operating expenses	12,819	13,335	15,606	11,990	12,029	12,186	11,568	7,485	53,750	43,268
Loss from operations	(12,708)	(11,534)	(15,352)	(11,636)	(11,918)	(12,075)	(9,457)	(7,374)	(51,230)	(40,824)
Net loss	$ (11,931)	$ (10,748)	$ (14,591)	$ (11,165)	$ (11,697)	$ (11,924)	$ (9,388)	$ (7,368)	$ (48,435)	$ (40,377)
Net loss per share attributable to common stockholders - basic and diluted	$ (0.47)	$ (0.43)	$ (0.59)	$ (0.55)	$ (0.74)	$ (1.66)	$ (4.70)		$ (2.03)	$ (6.00)
Net loss per unit attributable to common unit holders - basic and diluted								$ (4.49)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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