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Net Loss Per Share Attributable to Common Stockholders - Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net loss attributable to common stockholders—basic and diluted	$ (9,381)	$ (5,638)	$ (14,358)	$ (12,209)
Weighted-average number of common shares—basic and diluted (in shares)	20,856,693	20,831,723	20,853,628	20,831,139
Net loss per share attributable to common stockholders—basic and diluted (in USD per share)	$ (0.45)	$ (0.27)	$ (0.69)	$ (0.59)

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
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-Name Accounting Standards Codification
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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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