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Stock-based compensation - Restricted stock units (Details) - Restricted stock units $ / shares in Units, $ in Millions			6 Months Ended	12 Months Ended
	Jan. 05, 2016 shares	Mar. 29, 2015 $ / shares	Jun. 30, 2016 USD ($)	Dec. 31, 2014 tranche
Stock-based compensation
Total unrecognized compensation cost, net of estimated forfeitures, related to unvested stock options and restricted stock units | $			$ 1.9
Weighted average period for recognition of compensation cost related to unvested stock awards			3 years 170 days
CEO
Stock-based compensation
Vesting period	4 years
Grant date stock price (in dollars per share) | $ / shares		$ 43.47
Number of shares issued (in shares) | shares	250,000
Service-based | CEO
Stock-based compensation
Vesting period				24 months
Performance based restricted stock units | CEO
Stock-based compensation
Number of tranches | tranche				2
Vesting period				1 year
First year | CEO
Stock-based compensation
Percentage of shares vesting	25.00%
Next 12 quarters | CEO
Stock-based compensation
Vesting period	3 years

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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