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Net Loss per Share Attributable to Common Stockholders - Computation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net loss	$ (11,830)	$ (2,634)	$ (34,425)	$ (8,928)
Comprehensive loss	$ (11,830)	$ (2,634)	$ (34,425)	$ (8,928)
Net loss per share, basic and diluted (in dollars per share)	$ (0.48)	$ (0.16)	$ (1.47)	$ (0.54)
Weighted-average shares outstanding used to compute basic and diluted net loss per share (in shares)	24,768,581	16,527,000	23,417,417	16,527,000

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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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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