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Net Loss Per Share - Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net loss	$ (14,073)	$ (12,891)	$ (30,105)	$ (36,461)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	41,815,139	40,762,960	41,453,736	40,603,430
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.32)	$ (0.73)	$ (0.90)
Class A Common Stock
Numerator
Net loss	$ (10,467)	$ (9,369)	$ (22,255)	$ (26,076)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	31,100,994	29,624,794	30,644,955	29,038,566
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.32)	$ (0.73)	$ (0.90)
Class B Common Stock
Numerator
Net loss	$ (3,606)	$ (3,522)	$ (7,850)	$ (10,385)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	10,714,145	11,138,166	10,808,781	11,564,864
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.32)	$ (0.73)	$ (0.90)

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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- Definition

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
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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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