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Organization and operations (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended
Organization and operations (Details) (USD $)	Feb. 03, 2015	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014	Feb. 26, 2014
Subsidiary, Sale of Stock [Line Items]
Proceeds from initial public offering, net of offering costs	$ 79,900,000	$ 0	$ 80,435,430
Underwriting discounts, commissions, and offering expenses	8,000,000us-gaap_PaymentsOfStockIssuanceCosts
Retained earnings (accumulated deficit)			(14,028,441)	(8,010,860)
Cash		$ 10,711,252us-gaap_Cash	$ 110,522,454us-gaap_Cash	$ 33,854,153us-gaap_Cash	$ 0us-gaap_Cash
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued	5,491,191
Common stock, price per share (in usd per share)	$ 16.00
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued	91,191