Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

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-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (b)
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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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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Summary of significant accounting policies - Net loss per share - (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Pro Forma [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in common stock equivalent shares)										4,723,719	8,461,169	0
Add: Changes in fair value of preferred stock tranche liability										$ 9,750	$ 1,949
Net loss attributable to common stockholders	$ (8,817)	$ (6,914)	$ (6,746)	$ (15,813)	$ (5,197)	$ (4,411)	$ (4,864)	$ (3,211)	$ (3,833)	(38,290)	(17,683)
Accretion of redeemable convertible preferred stock to redemption value										(7,373)	$ (1,366)
Add: Accrued dividends on temporary equity										$ 1,245
Weighted average number of common shares outstanding, basic and diluted (in shares)									2,352	4,191,210	635,448
Redeemable convertible preferrred stock
Earnings Per Share, Pro Forma [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in common stock equivalent shares)											5,882,352	0
Unvested restricted common stock
Earnings Per Share, Pro Forma [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in common stock equivalent shares)										1,818,261	2,578,817	0
Outstanding stock options
Earnings Per Share, Pro Forma [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in common stock equivalent shares)										2,905,458		0