Net Loss per Share - EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator (basic and diluted):
Net loss attributable to common stockholders, basic	$ (6,529)	$ (29,026)	$ (17,508)	$ (47,120)
Net loss attributable to common stockholders, diluted	$ (6,529)	$ (29,026)	$ (17,508)	$ (47,120)
Denominator (basic and diluted):
Weighted average common shares outstanding basic and diluted (in shares)	20,482,032	18,956,445	20,433,564	18,873,297
Net loss per share, basic and diluted (in dollars per share)	$ (0.32)	$ (1.53)	$ (0.86)	$ (2.50)

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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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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